File:Anthony's photographic bulletin for (1896) (14759066526).jpg

Identifier: anthonysphotogr1896newy (find matches)
Title: Anthony's photographic bulletin for ..
Year: 1870 (1870s)
Authors:
Subjects: Photography
Publisher: New York : E. & H.T. Anthony & Co.
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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sulphate of iron for physical development, and Lately the number of developing agents at our command has been greatly increased by the advent of amidol, metol, el P ro, being that in most general use, will be the one I shall of. hut the same theory applies to all. A little light was recently thrown upon one action of pyTO DJ Mi. I I addon, whod out that pyTO itflelf I ed no tannine, action on g< latino I will go Im that there is do tanning action even with oxidized pyro, and •hat pyro is not a developer, it is a fact in chemistr) that any par- tance is alv dy for further combination with oxygen, and •on 1,1 pyrogallic acid, which is C0HS(OH)S, il will be seen dised, and il is, therefore, \ ery suitable for iping agi at on nt d and apply il to an i po ed plate, what takes place: liberated lighl has m ted, and it is this liberal d bro at ine. n pj ro were a tannine, agi m, . the plate li developed with pyro, and then ■ upon w in- h Ughl ha to.1 m ted, and where th< ie latlon
Text Appearing After Image:
AMONG THE DAISIES.Photograph and Half-Tone by H. Laney. 4i4 has been no development of an image, is dissolved, would be impossible. I hold thetheory that it is the nascent bromine that tans the gelatine. If a plain gelatine plate is soaked in a solution of pyro and ammonia for severalhours, and then put in hot water, it will melt readily, proving that, although sub-jected to the action of oxidized pyro, no tanning action has taken place. I know-that old notions are hard to get rid of, as is the so-called rising and setting of thesun. which is only illusive. Things are not what they seem, and this tanning action,though appearing to be produced by pyrogallic action, is not due to it. Now, as to the development of the image, what is the constitution of the imagein the plate? It has been said that the undeveloped image in the plate consists ofsilver sub-bromide ; but silver sub-bromide has never yet been proved to be present,and there is no evidence that silver sub-bromide has been made,

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