The American annual of photography . f the Annual may care to experiment iii themaking of filters for the Dufay plate, for use with arc light,etc., using some of the various formulae for the dyes and thenmixing them with gelatine and flowing on a glass plate. Ifthere are such, I am glad to be able to give a formula of myown for the making of the solutions. Chloroform . 20 cc. -#Ether 100 cc. Ethyl Alcohol 84 cc. Dye Sol 30 cc. (Amount of dye required in 30 water.) Hydrogen peroxide 30 cc. Gelatine 4 grams Of course this may be made up in any quantity using theabove proportions, an
The American annual of photography . f the Annual may care to experiment iii themaking of filters for the Dufay plate, for use with arc light,etc., using some of the various formulae for the dyes and thenmixing them with gelatine and flowing on a glass plate. Ifthere are such, I am glad to be able to give a formula of myown for the making of the solutions. Chloroform . 20 cc. -#Ether 100 cc. Ethyl Alcohol 84 cc. Dye Sol 30 cc. (Amount of dye required in 30 water.) Hydrogen peroxide 30 cc. Gelatine 4 grams Of course this may be made up in any quantity using theabove proportions, and you will find that it will dry in aboutten minutes, clear, and hard. Keep away from fire while it isdrying, also keep your stock solution from the heat. Thismixture of gelatine, dye, and the alcohols and ethers, will drymuch quicker than an aqueous solution of gelatine, will dryclear, and does not frill in drying. Another point—another formula—that may prove very help-ful. Many of us have used glossy paper that had abrasion 48. H. LIFSHEY. marks on it, in spite of non-abrasion developers, iodide ofpotassium and much care. There are non-abrasion sodas onthe market, but they are a trade secret. The trade secret doesnot exist long in a chemical laboratory, and the followingformula will be found to do all that any non-abrasion soda Sodium Sulphite i oz. 29 grams Sodium Carbonate 370 grains 24 grams C. P. Hypo 8 grains ^ gram A mixture in these proportions may be used in place of sodafor paper or Sodium Carbonate grams C. P. Hypo grams Water to cc. Use 10 cc. to every litre of developer. 49 There has been for some time in Europe, a method of sen-sitizing autochromes, in order to get more speed, and I haveno doubt that the Dufay or Omnicoloure would stand the sametreatment. The plates are bathed in the following solution incomplete darkness. Distilled water 66 cc. Ethy Alcohol pure—90 deg 33 cc. Dye solution 2 cc. Ammonia 30 cc. The dye solution mentioned i
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