page_title: Glass coloring and color marking
section_title: Striking glasses
hierarchical_section_title: Glass coloring and color marking / Striking glasses
caption_attribution_description: English: Vintage Cranberry Glass - Thumbprint
context_page_description: Glass coloring and color marking may be obtained by in several ways.
  by the addition of coloring ions,
  by precipitation of nanometer sized colloides,
  by colored inclusions
  by light scattering
  by dichroic coatings, or
  by colored coatings
context_section_description: Selenium, like manganese, can be used in small concentrations to decolorize glass, or in higher concentrations to impart a reddish color, caused by selenium nanoparticles dispersed in glass. It is a very important agent to make pink and red glass. When used together with cadmium sulfide, it yields a brilliant red color known as "Selenium Ruby".
  Pure metallic copper produces a very dark red, opaque glass, which is sometimes used as a substitute for gold in the production of ruby-colored glass.
  Metallic gold, in very small concentrations (around 0.001%, or 10 ppm), produces a rich ruby-colored glass ("Ruby Gold" or "Rubino Oro"), while lower concentrations produces a less intense red, often marketed as "cranberry". The color is caused by the size and dispersion of gold particles. Ruby gold glass is usually made of lead glass with added tin.
  Silver compounds such as silver nitrate and silver halides can produce a range of colors from orange-red to yellow. The way the glass is heated and cooled can significantly affect the colors produced by these compounds. Also photochromic lenses and photosensitive glass are based on silver.
  Purple of Cassius is a purple pigment formed by the reaction of gold salts with tin(II) chloride.
caption: Cranberry glass bowl
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