. The silver sunbeam : a practical and theoretical text-book on sun drawing and photographic printing. at his plates would not keeplong after fuming, conceived the idea of exposing first andfuming afterward. In carrying out this idea, he found thatthe picture was developed to a certain extent by the action of the ammonia. The publicationof this fact induced other gentle-men to investigate the matter, andthus has been worked out the proc-ess of alkaline development. The yellow light ordinarily usedto illuminate the dark room in thewet collodion process is too strongfor the bromide emulsion proc
. The silver sunbeam : a practical and theoretical text-book on sun drawing and photographic printing. at his plates would not keeplong after fuming, conceived the idea of exposing first andfuming afterward. In carrying out this idea, he found thatthe picture was developed to a certain extent by the action of the ammonia. The publicationof this fact induced other gentle-men to investigate the matter, andthus has been worked out the proc-ess of alkaline development. The yellow light ordinarily usedto illuminate the dark room in thewet collodion process is too strongfor the bromide emulsion dark ruby red glass is requiredwith the latter process on accountof its excessive sensitiveness. Pure distilled water, or water ob-tained by melting ice, should beused for making the silver negativesolution. Rain water should neverbe used unless it has first been puri-fied by adding a little nitrate of sil-ver to it and leaving it to stand inthe sunlight as long as any deposittakes place. Collodions for all photographicuses are manufactured by us ; we also keep a supply fromall other CHAPTEE LXIII. ORGANIC DEVELOPERS. There have been used many developers compounded ofthe ordinary salt of iron and different organic matters. Oneof the best of these is made as follows : Make a solution ofgelatin, ten grains to the ounce of water, and a solution of tan-nin, fifteen grains to the ounce of water. While the gelatinsolution is warm, add to it three drops of the tannin solution,and mix thoroughly. Add one drop of this mixture to each Fig. 8.
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