File:The American annual of photography (1917) (14597498547).jpg

Identifier: americanannualof1917newy (find matches)
Title: The American annual of photography
Year: 1917 (1910s)
Authors:
Subjects: Photography
Publisher: New York : Tennant and Ward
Contributing Library: Harold B. Lee Library
Digitizing Sponsor: Brigham Young University

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20 grams—sodium sul-phite (anhydrous) 150 grams—lithium hydrate 8 grams. Dis-solve the sodium sulphite in about 800 cc of hot water, whendissolved add the para-amidophenol. Dissolve the lithiumhydrate in about 100 cc of water and add to the first solutionwith constant stirring. A heavy precipitate will form, and thelithium solution should be added until this precipitate justdissolves. The bulk of the solution should be made up to1000 cc and bottled. This is to all intents and purposes—Rodinal. Should the given amount of lithium hydrate refuse to dis-solve the precipitate first formed do not allow the bulk to goabove 1000 cc, but add tiny pieces of lithium hydrate untilsolution takes place. Should the precipitate be dissolved whenonly part of this hydrate solution has been added, do not addthe rest—but make up to 1000 cc with water. Pyro.Our old friend pyro if used with an excess of sodium sul-phite and a little potassium ferro-cyanide (not ferri) will giveexcellent prints. 130
Text Appearing After Image:
JOY. Copyright by Albert B. Street. 131 The following formula will be found to give good resultsand is based on one given by the Ansco Co. No. I—Pyro 12 gms Sodium Sulphite 80 grams Potassium Ferrocyanide (not ferri) 2 grams Water 500 cc No. 2—Sodium Hydrate 4 grams Water 500 cc Use one part No. i and one part No. 2 with water 2 parts,and 3 drops of saturated solution of Potassium Bromide toevery 400 cc of developer. The potassium ferrocyanide takesup all the oxidation products and reduces staining to a mini-mum. The colour is very good and the developer may be usedrepeatedly without materially reducing its speed which isabout one to one and a quarter minutes. This also gives verygood prints for sepia toning. If diluted to half strength itgives softer results without changing the gradation too much. Ferrous Oxalate.Ferrous oxalate also makes a good developer for any paperand a formula may be welcome. No. I—Ferrous sulphate 250 gms Sulphuric acid 3 cc Warm water 1000 cc Dissolve

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