MWG Image Gallery of Damages

Category:Material Damage
 back to Choosing Materials for Storage, Exhibition & Transport
This Gallery provides images that document deterioration or damage caused by the use of inappropriate or incompatible materials for the storage, exhibition, and transport of cultural heritage artifacts. Please use these images and the associated information as a learning resource and share with colleagues so that we may all better care for the objects of our shared history. For more information on choosing appropriate materials visit the Choosing Materials for Storage, Exhibition & Transport and consult the Materials Testing Tables for Oddy and other test results.
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A Note About the Organization of the Page: The first gallery includes all images on the page with the most currently posted images at the beginning. The galleries that follow are organized by the material that is damaged. Please contact Justine Wuebold or Emma Guerard for corrections or suggestions. 
If you have an image you would like to add to the gallery please see the discussion page for instructions. 
This page is managed by members of AIC's Materials Selection and Specification Working Group (MWG). Contributors include those who have worked on the setup and maintenance of this page and/or contributed images: Justine Wuebold, Samantha Springer, Emma Guerard, Patty Silence, Judy Jungels, Morten Ryhl-Svendsen, Gwen Spicer, Olivia Kohler-Maga, Paul Collomon, Ian McCleod
 
==Most recent images==
File:Wood-discoloration-cling-wrap-Carrlee.jpg|Wood. Discoloration caused by contact with plastic cling film. Comments: This wooden platter arrived at the museum wrapped in plastic cling film. The plasticizers in the wrap reacted with the finish on the wood, leaving these disfiguring marks. Image credit: Alaska State Museums.
File:Shell-urethane-foam-accretion-Carrlee.jpg|Shell. Accretion or Deposit caused by contact with degrading soft urethane foam. Comments: This delicate shell collection had been packed with soft urethane foam that became sticky and crumbly with age. Image credit: Alaska State Museums.
File:Paper-poster-putty-stain-Carrlee.jpg|Paper. Stain caused by contact with poster putty. Comments: Poster putty holding paper to the wall leaves an oily stain after several months. Image credit: Alaska State Museums.
File:Metal Lead-Corrosion Carrlee.jpg|alt=The lead hands of this kayaking figure have corroded with exposure to pollutants.|Metal. Corrosion on lead caused by pollutant exposure. Comments: The lead hands of this kayaking figure have corroded with exposure to pollutants. Image Credit: Alaska State Museums
File:Cardboard backing.jpg|alt=The backing on this framed artwork was acidic cardboard. The acids from the cardboard were blocked in places a logo was painted on the cardboard, and that can be seen in the pattern of yellowing on the back of the paper artwork.|Paper. Acid Migration caused by contact with cardboard. Comments: The backing on this framed artwork was acidic cardboard. The acids from the cardboard were blocked in places a logo was painted on the cardboard, and that can be seen in the pattern of yellowing on the back of the paper artwork. Image Credit: Alaska State Museums.
File:Marble damage efflorescence magnesium formates cleveland CMA.jpg|alt=Detail image of salt efflorescence on a marble object.|Marble. Efflorescence of salts noted on areas of previous repair. FTIR indicated magnesium formates. Image credit: Photograph by Cleveland Museum of Art.
File:Efflorescence-glass-white-crystals.png|Glass. Crystals caused by pollutants in air. Comments: Pollutants from off-gassing storage materials caused acetate salts to form on black glass beads.Image credit: Photograph by David Thickett.
File:Formate-efflorescence-crystal on glass.png|Glass. Crystals caused by offgassing storage materials.Comments: Pollutants from off-gassing storage materials caused acetate salts to form on black glass beads.Image credit: Photograph by Dr. Katherine Curran.
File:1974 172 formate and acetate crystals on redware.jpg|Ceramics. Efflorescence caused by offgassing storage materials.Comments: Acetic and formic acid from wood storage materials likely caused the formation of the calcium formate and acetate salts on this redware pitcher.Image credit: Photograph by Pam Hatchfield © MFA Boston.
File:Calcium formate and acetate detail-on-terra-cotta.jpg|Ceramics. Efflorescence caused by offgassing storage materials.Comments: Seen under magnification calcium formate and acetate salts on redware caused by offgassing of acetic and formic acid from wood storage materials.Image credit: Photograph by Pam Hatchfield © MFA Boston.
File:Hazing on glass Cellulose-Nitrate offgassing.jpg|Glass. Hazing caused by degradation of cellulose nitrate within. Comments: The glass jar trapped nitric acid released by a degrading cellulose nitrate object within.Image credit: Photograph by Pam Hatchfield © MFA Boston.
File:Lead formate on copper alloy bowl-white-crystals-efflorescence.jpg|Metals. Corrosion caused by offgassing wood.Comments: Lead formate crystals formed on the copper alloy due formic acid pollutants in the air.Image credit: Photograph by Pam Hatchfield © MFA Boston. 
==CERAMICS & GLASS==
File:Glass-degradation-formate-salts-microscope-thickett.JPG|Glass. Crystals caused by offgassing storage materials.Comments: Pollutants in the air caused formate salts to develop on the glass surface (seen with magnification.)Image credit: Photograph by David Thickett.
File:Formate-salts-glass-efflorescence-thickett.JPG|Glass. Crystals caused by offgassing storage materials.Comments: Pollutants in the air caused formate salts that resemble snowflakes to develop on the glass surface (seen with magnification.)Image credit: Photograph by David Thickett.
File:Sodium_formate_crystals-salts-glass.jpg|Glass. Crystals caused by pollutants.Comments: White sodium formate-acetate crystals (seen with magnification) developed on this blue glass due to pollutants in the case.Image credit: Photograph by Pam Hatchfield © MFA Boston.
File:Glass-efflorescence-white-Sodium_formate-acetate.png|Glass. Crystals caused by pollutants.Comments: White sodium formate-acetate crystals developed on this blue glass due to pollutants in the case.Image credit: Photograph by Pam Hatchfield © MFA Boston.
File:Efflorescence-glass-white-crystals.png|Glass. Crystals caused by pollutants in air. Comments: Pollutants from off-gassing storage materials caused acetate salts to form on black glass beads.Image credit: Photograph by David Thickett.
File:Formate-efflorescence-crystal_on_glass.png|Glass. Crystals caused by offgassing storage materials.Comments: Pollutants from off-gassing storage materials caused acetate salts to form on black glass beads.Image credit: Photograph by Dr. Katherine Curran.
File:1974_172_formate_and_acetate_crystals_on_redware.jpg|Ceramics. Efflorescence caused by offgassing storage materials.Comments: Acetic and formic acid from wood storage materials likely caused the formation of the calcium formate and acetate salts on this redware pitcher.Image credit: Photograph by Pam Hatchfield © MFA Boston.
File:Calcium_formate_and_acetate_detail-on-terra-cotta.jpg|Ceramics. Efflorescence caused by offgassing storage materials.Comments: Seen under magnification calcium formate and acetate salts on redware caused by offgassing of acetic and formic acid from wood storage materials.Image credit: Photograph by Pam Hatchfield © MFA Boston.
File:Hazing_on_glass_Cellulose-Nitrate_offgassing.jpg|Glass. Hazing caused by degradation of cellulose nitrate within. Comments: The glass jar trapped nitric acid released by a degrading cellulose nitrate object within.Image credit: Photograph by Pam Hatchfield © MFA Boston.
File:Earthenware-ceramic-efflorescence-case-pollutants-salt-Hatchfield-3.jpeg|Ceramics. Efflorescence caused by pollutants from case materials.Comments: Tetramethyl Piperidinol (TMP) from gasket reacts with acids in/on porous materials to form salts like TMP chloride (above) which appears as fluffy white crystals on the surface.Image credit: Photograph by Pam Hatchfield © MFA Boston.
File:Earthenware-ceramic-efflorescence-case-pollutants-salt-Hatchfield.jpeg|Ceramics. Efflorescence caused by pollutants from case materials.Comments: Tetramethyl Piperidinol (TMP) from gasket reacts with acids in/on porous materials to form salts like TMP chloride (above) which appears as fluffy white crystals on the surface.Image credit: Photograph by Pam Hatchfield © MFA Boston.
File:Earthenware-ceramic-efflorescence-case-pollutants-salt-Hatchfield-2.jpeg|Ceramics. Efflorescence caused by pollutants from case materials.Comments: Tetramethyl Piperidinol (TMP) from gasket reacts with acids in/on porous materials to form salts like TMP chloride (above) which appears as fluffy white crystals on the surface.Image credit: Photograph by Pam Hatchfield © MFA Boston.
File:Glass-Fingerprint-etched-damage-Springer.JPG|Glass. Etching caused by acid.Comments: Acids from direct handling of glass caused the fingerprint to be etched into the surface.Image credit: Photograph by Samantha Springer.
File:Ceramic-salts-damage-efflorescence-white-met-AIC-News.jpg | Ceramics. Efflorescence caused by direct contact with open-cell polyester polyurethane."Comments:" White amine deposits formed on the lower glazed portion of the jar and the unglazed base where it had been stored with polyurethane foam. The object and foam lining were stored in a cardboard box for a period of 10 years.Image credit: Photograph by Donna Strahan, © The Metropolitan Museum of Art.
==IVORY, EGG, BONE, & SHELL==
File:Shell-urethane-foam-accretion-Carrlee.jpg|alt=Accretion or Deposit caused by contact with degrading soft urethane foam. This delicate shell collection had been packed with soft urethane foam that became sticky and crumbly with age.|Shell. Accretion or deposit caused by contact with degrading soft urethane foam. Comment: This delicate shell collection had been packed with soft urethane foam that became sticky and crumbly with age. Image credit: Alaska State Museums. 
File:Peabody shell powdering.jpg|Shell. Powdering of shell at edges from acidic storage material. Comments: Acidic pollutants in storage cause the breakdown of the shell matrix and the material to powder at the edges. Image Credit: © President and Fellows of Harvard College, Peabody Museum of Archaeology and Ethnology
File:Callomon bynes.jpg|Shell. Crystal damage by acidic pollutants from housing materials. Comments: Shell on left showing Bynesian decay, the breakdown of Calcium carbonate in the shell and growth of other salt crystals in the presences of acidic vapors. Photo Credit: Paul Callomon 
==METALS==
File:Metal Lead-Corrosion Carrlee.jpg|Metal. Corrosion on lead caused by pollutant exposure. Comments: The lead hands of this kayaking figure have corroded with exposure to pollutants. Image Credit: Alaska State Museum.
File:Lead formate on copper alloy bowl-white-crystals-efflorescence.jpg|Metals. Corrosion caused by offgassing wood.Comments: Lead formate crystals formed on the copper alloy due formic acid pollutants in the air.Image credit: Photograph by Pam Hatchfield © MFA Boston.
File:Cellulose-nitrate-metal-corrosion-broken-tooth.jpg|Metals. Corrosion caused by air contaminationComments: Acids from the breakdown of the cellulose nitrate of the comb caused the metal to corrode; tooth of comb broken during use or handling.Image credit: Photograph by Jen Cruse.
File:Cellulose-nitrate-metal-corrosion-deposit.jpg|Metals. Corrosion caused by air contaminationComments: Acids from the breakdown of the cellulose nitrate of the comb caused the metal to corrode; deposit source unknown.Image credit: Photograph by Jen Cruse.
File:Silver-tarnish-sulfur-pollutants-Thickett.png|Metals. Corrosion caused by air pollution.Comments: Sulfur in the air caused dark tarnish on surface of silver ladle.Image credit: Photograph by David Thickett.
File:Bronze-corrosion-Thickett.png|Metals. Corrosion caused by contamination in air.Comments: Similar to rust on iron, this type of corrosion is likely caused from the presence of chlorides and of the alloy and water (or humidy) from the air. Image credit: Photograph by David Thickett.
File:Lead-acetate-corrosion-Thickett.png|Metals. Corrosion caused by air contamination. Comments: Acetic acid in the presence of lead can lead to the formation of lead acetate on the surface of the metals. Acetic acid may be offgassed by common gasketing materials or enclosures. Image credit: Photograph by Dr. Katherine Curran.
File:CN handbag corrosion.jpg|Metals. Corrosion caused by air pollutants.Comments: Metal hinge attaching cellulose nitrate handle to handbag is heavily corroded causing blue powdery crystals to form on surface of metal, and utimately detaching handle from bagImage credit: Photograph by van Aubel van Rooijen, Plastic Identification Tool.
File:Silver-tarnish-sulfur-pollutants-plastic-ID-tool.jpeg|Metals.Corrosion caused by air pollutants.Comments:Sulfur in the air and from silk degradation products caused dark tarnish on silver knives.Image credit: Photograph by van Aubel van Rooijen, Plastic Identification Tool.
File:CCI 87306-0059.jpg|Metal. Corrosion due to acidic storage pollutants. Comments: White, powdery corrosion present on lead and pewter in storage drawer. Corrosion rates differ according to metal alloy and stability of patina. Corrosion is the result of organic acids from the immediate environment. Lead particularly prone to this type of corrosion. Image credit: © Government of Canada, Canadian Conservation Institute.
File:CCI 120260-0051.jpg|Metal. Corrosion known as tarnish caused by air pollutants. Comments: A tarnished silver cup, showing a range of colors. Image credit: © Government of Canada, Canadian Conservation Institute.
File:CCI 128118-0002.jpg|Metal. Corrosion particulate caused by acidic pollutants from storage cabinent. Comments. Corrosion from acetic acid pollutant is visible as white particulate at the bottom of the exhibition cabinet. Image credit: © Government of Canada, Canadian Conservation Institute.
File:CWBrassEtchedByRedAccessionNumberPaint.JPG|Metal. Etching of surface by paint. Comments: Red accession number paint applied without barrier coat etched into brass surface. Image credit: Colonial Williamsburg Foundation
File:CW GreenCorrosionOnBrassFromBeeswax.jpg|Metal. Corrosion caused by pollutants and moisture trapped by beeswax. Comments: Green copper corrosion products exposed after beeswax removed likely due to prolonged contact with contaminants and moisture.Image credit: Colonial Williamsburg Foundation
File:CW LemonEtchedIntoPewter.jpg|Metal. Etching caused by direct contact of acidic material.Comments: Acids from lemon in direct contact with pewter caused the shape to be etched into the surface and discoloration.Image credit: Colonial Williamsburg Foundation
File:Ryhl Svendsen01pilgrim.jpg|Metal. Corrosion due to wood acid exposure.Comments: Continued exposure to acids from the MDF board backing caused lead corrosion. Drawing at left shows condition prior to installation.Image credit: Morten Ryhl-Svendsen, IAQ in Museums and Archives
File:Macleod copper-corrosion.jpg|Metal. Corrosion from acidic air pollutants Comments: Corrosion to galvanized mild steel screws and chrome plated iron hinge from acetic acid vapors released from wood. Image credit: Ian MacLeod 
==PAINT/PAINTINGS==
File:Pullman_bubblewrap.jpg|Paint. Plasticizer migration, Surface disruption and change in sheen to paint. Comments: Paint sheen and texture is disrupted due to long-term contact with bubble wrap, most likely due to plasticizer migration. Photo credit: Olivia Kohler-Maga
==PAPER/PHOTO==
File:Cardboard backing.jpg|alt=The backing on this framed artwork was acidic cardboard. The acids from the cardboard were blocked in places a logo was painted on the cardboard, and that can be seen in the pattern of yellowing on the back of the paper artwork.|Paper. [Acid Migration] caused by contact with cardboard. Comments: The backing on this framed artwork was acidic cardboard. The acids from the cardboard were blocked in places a logo was painted on the cardboard, and that can be seen in the pattern of yellowing on the back of the paper artwork. Image Credit: Alaska State Museums.
File:Paper-poster-putty-stain-Carrlee.jpg|alt=Stain caused by contact with poster putty|Paper. Stain caused by contact with poster putty. Comments: Poster putty holding paper to the wall leaves an oily stain after several months. Image credit: Alaska State Museums.
File:Daguerreotype-glass-corrosion-hazing-fogging.jpg|Photo/Glass. Fogging caused by pollutantsComments: Sodium formate salts developed on the interior surface of the glass covering this daguerreotype.Image credit: Photograph by David Thickett.
File:Ryhl Svendsen02 rc photo.jpg|Photo. Yellowing and Fading due to oxidation from poor quality storage materials. Comments: Print on right was pinned to chipboard and displayed for six months while left print was stored in acid-free pure alpha-cellulose sleeve. Image credit: Morten Ryhl-Svendsen, IAQ in Museums and Archives
File:Peabody Paper acidstain.jpg|Paper. Darkening and discoloration due to exposure to poor quality housing material. Comments: Matburn on the artwork is caused by physical contact with poor-quality acidic window mount. Image credit: © President and Fellows of Harvard College, Peabody Museum of Archaeology and Ethnology
File:Peabody adhesivestain.jpg|Paper. Stain caused by poor quality adhesive and backing material. Comments: Brown staining caused by physical contact of degraded adhesive and acidic backing materials. Image credit: © President and Fellows of Harvard College, Peabody Museum of Archaeology and Ethnology
File:Cannon matburn.jpg|Paper. Darkening/Discoloration by contact from poor-quality housing materials. Comments: Mat burn caused by physical contact with poor-quality acidic window mount additionally stored in inappropriately regulated environment. Image Credit: Alice Cannon, Australian Institute for the Conservation of Cultural Materials 
==PLASTIC (SYNTHETIC)==
File:Translucent-cellulose-nitrate-degradation-crazing.JPG|Plastics (Synthetics). Crazing caused by inherent vice.Comments: The auto-catalytic degradation of cellulose nitrate causes crazing and structural cracking which leads to loss.Image credit: Photograph by Jen Cruse.
File:Hairpin-cellulose-nitrate-crazed-craquelure-broken.JPG|Plastics (Synthetics). Crazing caused by inherent vice.Comments: The auto-catalytic degradation of cellulose nitrate causes crazing and structural cracking which leads to loss.Image credit: Photograph by Jen Cruse.
File:Xylonite-comb-crazed-vinegar-odor-offgassing-autocatalytic-degradation.JPG|Plastics (Synthetics). Crazing caused by inherent vice.Comments: The auto-catalytic degradation of cellulose nitrate causes crazing and structural cracking which leads to loss.Image credit: Photograph by Jen Cruse.
File:PUR_flexibel_efflorescence_01_1.jpg|Plastics (Synthetics). Efflorescence caused by photo-oxidation and hydrolysis.Comments: Flexible polyurethane starting to develop a white bloom due to exposure to light and oxygen.Image credit: Photograph by van Aubel van Rooijen, Plastic Identification Tool.
File:PUR_flexible-polyurethane_efflorescence-white-bloom-plastics-id-tool.jpg|Plastics (Synthetics). Efflorescence caused by photo-oxidation and hydrolysis.Comments: Transparent red flexible polyurethane with fingerprints in white surface bloom due to exposure to light and oxygen.Image credit: Photograph by van Aubel van Rooijen, Plastic Identification Tool.
File:Synthetic-Rubber_dirty-sticky-surface.jpg|Plastics (Synthetics). Deposit accumulated in tacky surface. Comments: Soiling accumulates in the tacky surface of synthetic rubber due to the degradation of the material.Image credit: Photograph by van Aubel van Rooijen, Plastic Identification Tool.
File:Synthetic-Rubber_dirty-soiled-tacky-surface.jpg|Plastics (Synthetics). Deposit accumulated in tacky surface. Comments: Soils accumulate on the tacky surface of synthetic rubber without proper housing and handling.Image credit: Photograph by van Aubel van Rooijen, Plastic Identification Tool.
File:Synthetic-Rubber-tacky-dirty-plastics-id-tool.jpg|Plastics (Synthetics). Deposit accumulated in tacky surface. Comments: Soils accumulate on the tacky surface of synthetic rubber without proper housing and handling.Image credit: Photograph by van Aubel van Rooijen, Plastic Identification Tool.
File:PE_crazing-polyethylene-loss-plastics-id-tool.jpg|Plastics (Synthetics). Crazing and loss caused by photo-oxidation.Comments: Polyethylene developed fine cracks and eventually crumbled at the thin edges after exposure to light and oxygen (seen under magnification).Image credit: Photograph by van Aubel van Rooijen, Plastic Identification Tool.
File:PE_crumbled_away_1.jpg|Plastics (Synthetics). Crazing and loss caused by photo-oxidation.Comments: Polyethylene developed fine cracks and crumbled away at the top after excess exposure to light and oxygen.Image credit: Photograph by van Aubel van Rooijen, Plastic Identification Tool.
File:PMMA_crazing_polymethylmethacrylate-photo-oxidation-damage.jpg|Plastics (Synthetics). Crazing caused by photo-oxidation.Comments: Poly(methyl methacrylate) PMMA developed fine crack pattern due to excess exposure to light and oxygen and subsequent absorption and desorption of moisture.Image credit: Photograph by van Aubel van Rooijen, Plastic Identification Tool.
File:PMMA_crazing_spoon-polymethylmethacrylate-plastics-id.jpg|Plastics (Synthetics). Crazing caused by photo-oxidation.Comments: Poly(methyl methacrylate) PMMA developed fine crack pattern due to excess exposure to light and oxygen and subsequent absorption and desorption of moisture.Image credit: Photograph by van Aubel van Rooijen, Plastic Identification Tool.
File:PMMA_crazing_detail-plastics-id-tool.jpg|Plastics (Synthetics). Crazing caused by photo-oxidation.Comments: Poly(methyl methacrylate) PMMA developed fine crack pattern due to excess exposure to light and oxygen and subsequent absorption and desorption of moisture (seen with magnification).Image credit: Photograph by van Aubel van Rooijen, Plastic Identification Tool.
File:PP_crazing_polypropylene-degradation.jpg|Plastics (Synthetics). Crazing caused by photo-oxidation.Comments: Colored Polypropylene developed fine cracks after excess exposure to light and oxygen.Image credit: Photograph by van Aubel van Rooijen, Plastic Identification Tool.
File:PE_crazing_polyethylene-crack-distorted-plastics-id-tool.jpg|Plastics (Synthetics). Crazing and deformation caused by photo-oxidation.Comments: Colored Polyethylene has deformed, cracked, and developed surface crazing due to photo-oxidation.Image credit: Photograph by van Aubel van Rooijen, Plastic Identification Tool.
File:Display-case-pollutants-interior-crystals-Hatchfield.jpeg|Plastics (Synthetics). Efflorescence caused by pollutants from case materials.Comments: Pollutants from gasket on case react to form salts (above) which appears as fluffy white crystals on the case interior.Image credit: Photograph by Pam Hatchfield © MFA Boston.
File:CN_glasses_sugar_effect_corrosion_02.jpg|Plastics (Synthetics). Sugaring or Powdering caused by air pollutants.Comments: Corrosion causing a visible layer of salt crystals to form on cellulose nitrate glassesImage credit: Photograph by van Aubel van Rooijen, Plastic Identification Tool.
File:CN_glasses_sugar_effect_corrosion_01.jpg|Plastics (Synthetics). Sugaring or Powdering caused by air pollutants.Comments: Corrosion causing a visible layer of salt crystals to form on cellulose nitrate glassesImage credit: Photograph by van Aubel van Rooijen, Plastic Identification Tool.
==STONE==
File:Marble damage efflorescence magnesium formates cleveland CMA.jpg|alt=Detail image of salt efflorescence on a marble object.|Marble. Efflorescence of salts noted on areas of previous repair. FTIR indicated magnesium formates. Image credit: Photograph by Cleveland Museum of Art.
File:Organic_acid_salt_on_agate_and_metal-white-corrosion.jpg|Stone. Corrosion and efflorescence caused by pollutants.Comments: White organic acid salts formed on the agate and metal from pollutants released by storage materials.Image credit: Photograph by Pam Hatchfield © MFA Boston.
==TEXTILES==
File:Peabody_Dresswithpaint.jpg|Textile. Stain from installation paint. Comments: Dress damaged from paint applied to display materials in installation. Image credit: © President and Fellows of Harvard College, Peabody Museum of Archaeology and Ethnology
File:Spicer_textile_acid_staining.jpg|Textile. Stain and darkening by contact from acidic material Comments: Military, Navy uniform hung in physical contact on a wooden hanger. Image credit: Gwen Spicer, Spicer Art Conservation, LLC 
==WOOD==
File:Wood-discoloration-cling-wrap-Carrlee.jpg|alt=Discoloration caused by contact with plastic cling film. This wooden platter arrived at the museum wrapped in plastic cling film.|Wood. Discoloration caused by contact with plastic cling film. Comments: This wooden platter arrived at the museum wrapped in plastic cling film. The plasticizers in the wrap reacted with the finish on the wood, leaving these disfiguring marks. Image credit: Alaska State Museums.
File:Wood-light-damage-fading-crack-humidity-Springer.jpeg|Wood. Discoloration caused by light.Comments: Light radiation has caused fading, visible on the front face of the box. Large crack along wood grain caused by incorrect RH.Image credit: Photograph by Samantha Springer.
File:Wood-salts-damage-efflorescence-PUR-met-AIC-News.jpg|Wood. Efflorescence formed after storage with open-cell polyester polyurethane.Comments: Dendritic, white amine deposits formed on the wood object, after it was wrapped in polyethylene sheeting and placed on polyethylene foam for approximately 5 years.Image credit: Photograph by Adriana Rizzo, © The Metropolitan Museum of Art.
File:Wood-salts-damage-efflorescence-white-met-AIC-News.jpg|Wood. Efflorescence caused by direct contact with open-cell polyester polyurethane. Comments: Acicular, dendritic white amine deposits formed where the wood object was cushioned by polyurethane foam. The efflorescence is made of thin, sticky filaments.Image credit: Photograph by Hiromi Nomurajima, © The Metropolitan Museum of Art.