The sciopticon manual, explaining lantern projection in general, and the sciopticon apparatus in paricular (1877)

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SCIOPTICON MANUAL. 71 THE COLLODIO-CHXORIDE PROCESS. (From Humphrey's Journal.) The following formula is not only used for opal pic- tures, but to some extent for transparencies also. 1. Take the whites of two eggs and two ounces of water, beat well to a froth, and let it settle for two hours and pour off the clear solution. 2. Coat your white plate with this solution (as you would with collodion), and set away to dry. "When dry take in your dark-room and coat the plate with the " opal solution," which is made thus: Plain collodion 8 oz. (thinner than you would use for iodizing), then dissolve in as little water as possible 60 grains nitrate of silver, and add this to the collodion and shake well. Then dissolve 16 grains of strontium in as little water as possible, and add this to the collodion and shake well. Then dissolve 10 grains citric acid in as little water as possible, and add to the collodion. Shake well, and you have the opal solution. "When dry, put your negative in the printing-frame, lay the opal-prepared plate on the negative, and print from 10 to 15 minutes in the sun, and print much darker than you would a photograph. Tone and fix as you would a photograph, only you need not wash before toning — and wash but little before fixing. The "opals" tone in one-tenth the time of a photograph. Keep the opal preparation in a dark-room. Have your toning bath a little alkaline, and not as strong as for toning photographs.