New-York daily tribune. [volume] (New-York [N.Y.]) 1842-1866, 1853-03-04
Colored Daguerreoiypes.

We find in a late number of The Scientific
american an article by James Campbell OF
Dayton, Ohio, giving the results Of some ex-
periments made to produce colored Daguerreo-
types from which We make the following very
interesting extracts
Becquere and Niepce de 81 Victor have proved tina,
chloride O. silver containing slight trace OF copper be
exposed % the prismsc spectrum 20 rays Of dfer
eui colors while undergoing this reduction il IS suscep
tibe If coorLticn sitter prutracted exposure From
this wsud seem tbs; this process might be much
celebrated careful 10 sid nature in her opera
tions, instead Of trying mere hap hazard experiments,
not based on rational theory. viii show by few ex.
permeDts thai lhk may be- done and ~ syo being too
pIolx Wal al present, speak OF the chlordAted silver
plate, unGoctlersted BY iodine, bronine, fuorne
chrome or their compounds.
II tie plate covered c.h the enaneied chloride OF
silver prepared by Niepoe's process be exposed 20 a
current OF hydrogen while receiving the image the pro
osss viii be much accelerated and the image will be
Impressed in from half an hour 10 an hour; accordng
10 the amount OF passed INFO the camera tn light
Temperature electric OF the atmosphere. &c,
stead Of requiring from three 70 ave hours. in the
original process and the cOlors vi the picture VIII be
impressed the plate In Al their orginsl beauty. THIS
experiment mey be very ecsay performed, Il only
curing few grains OF zinc in = small vial containing
dilute sulphufc acid The vial and rs may be
placed IN the canert. and the hydrogen being .
L in IL active state AMI il perfectly transpsr.
enf, permits The light 10 act the plate, while II
h itself eDcseed in reducing the chloride, which II b
only capable Of dong in sunlight
The hydrogen, probably fro n its aihaty for oxygen
kssens the decC mPosfon OF the organic aiter ami
essts reducing the chloride, thus ac.is deoxy.
eating snc dectiorcaig agent Thefeis hoseyer sui.
ncieIi hydrogen contained N tue combined or gaaic
matter eject The reduction Of the chloride hence i
prCbsble that the excess merely hastens the decon.
position
Following this train Of Investigation. have tried
many other reducing agents both liquid and gaseoas
The most important liquid agents tined have been the
prOts sUlphGle md LTuie Of nsa ferocy Eride of pot
1ssum protc chloride Of tin and the ausrdes Of pOtas
sium and sodium. The principal gaseous agents triei
ny drogen alone and IN eonhns ion with carbon AM
sulphur, ammonia, sulphCrc ether IN vapor
chlorcsornt vspor suiphuret OF carbon chorids al
sulphur hydrc-sulphu-et q scsnonia and salpdurp,Is
zcl AZ very remarkable results iolloWeafrom he ap-
pLcsiion Of tie gases vii speak Of them more parti.
culsry. S1lphurocs acid has strong tendency 20 sei
str1ef oxygen from organic bodies, also uares wi,h
chlorine IN sunlight, and DO shi and heavy caroures
tel hydrogen the lSrter indeed without the irngenec OF
hight Sgphurous Acid abstracts oxygen frOm orgsnie
bodies VIII which /; combines, forming saphurc acsi
and suphu;ic acid renders chloride Of silver usca.n
able 20 hgh; BY destroying the organic rns.ter WIKI
which = combined thence inferred ma. might De
used for the double purpose Of reducing and xnz he
picture Tnsi II powerful acceierSroT csrtzin TIE
rxirg requires further experiment
Pictures may be ObtA-ned WIKI this sss N hal an hour
BY passing nAseenf and in Sufficient quantity In DE
camera and the colcrs are preserved There j. how.
ever. sometimes litle sulphur deposiysi xnder tae
enamel which gives TIE hgh parts Of the prt1re vel
lew sh csst Th color msy Sometimes be removed By
bestng the plate. Csfbursfted hydrogen acts sal
quicker, probably from the tree carbon which resa.
from he Decomposition being Pc sesul reiucng agent,
and the carbon sot len gn1er the enamel prob1.
by passes OF under the f0r OF te volatile chloride o.
carbon obtNiLed ole piciure in Eve MINUTES. sy
passing into the camera the gzses gerersted from
6isriliag alcohol and sulphErc acid N rsto-f Tie
gs-es formed were oletsEs gas and sulpA1roCs aed
mixed with little light carburetied hydrogen and sai
phurc ether The colOrs very fairly represented.
but no, ~ good had previously obtained COAST
cred tbs exysri-1er. vsry encosrAgrs he; having