PLATINOTYPE 295 
but the residues should be sent to a refiner, who will allow 
cash for them, with the deduction of a small fee for refin- 
ing. An alternative plan is to mix the developing and acid 
baths, and immerse sheets of clean copper therein, when the 
platinum will be deposited on the copper as a precipitate. 
The platinum deposited on the copper can be scraped off, and 
mixed with the precipitated metal. 
PLATINO-URANOTYPE.—A little-used process (Reynolds). 
Two stock solutions are required: 
A. Uranium chloride, sat. sol. 
B. Potassium chloroplatinite 4g 60 gr. 
Water 48 ccm LY4 oz. 
Mix in equal volumes, paint over well-sized paper, and 
rapidly dry. Potassium chlorate may be added to increase 
contrast. Print until only a faint trace of an image is visible, 
and develop on a ferrous oxalate developer. Wash the prints 
in three successive baths of hydrochloric acid, about 1% per 
cent, wash, and dry. 
MERCURO-URANOTYPE.—Very little used (Reynolds). Two 
stock solutions are required: 
A. Saturated solution of uranium chloride 
B. Saturated solution of mercuric chloride 
For use mix 8 parts A with 1 part B and apply to paper. 
Expose until the image is seen in full strength, then float on 
a dilute solution of chloride of gold or potassium chloro- 
platinite. Wash in water acidified with hydrochloric acid, 
wash and dry. The toning may be omitted when warmer 
tones are obtained. 
PALLADIOTYPE.—Coat paper with uranium chloride, ferric 
oxalate, or sodium ferric oxalate, or a mixture of all three. 
Expose until the image is faintly visible; then float the print 
on: 
