PRINTING ON MATTE COLLODION PAPER.
Print deep or until the high lights are well tinted. Pay no attention to the shadows no matter how much they bronze. That will tone out.
negatives should be printed in the shade, while those that are dense and have much contrast can be printed in the sun.
Place prints in the water, one at a time, face down, pressing each print to the bottom of the tray ; not in a pile, but in an irregular manner, partly covering one another. This will stop all tendency of the paper to curl.
Should you use running water, prints should be handled over con tinually. If prints are to be washed by hand they should go through six changes of clear water, taking about five minutes for each change. During that time prints must be handled same as in running water. To tone properly they must be washed thoroughly. The best results are obtained when water is from 65' to 75° Fahr.
The toning of matte collodion paper is usually accomplished by the aid of two separate baths, the gold and platinum; but should one prefer a single bath, producing similar results, we recommend the "Aristo Single Toner," a toning agent combining in one the action of both the gold and platinum.
A print very slightly toned in the gold bath and toned long in the platinum bath takes a greenish or olive black tone, while a print toned to a purple in the gold bath and slightly toned in the platinum will give a pure black.
Prints require a thorough washing when coming from the gold bath, as gold precipitates platinum, and unless all the free gold is washed from the prints, the platinum will be precipitated to the bottom of the tray and not on the prints.
Chloride of Gold and Sodium, -- gr.
Water, - S ozs.
Add borax to make bath slightly alkaline. Test 'with red litmus paper. balk is sufficiently alkaline the litmus paper will turn blue slowly. Tone until purple, then wash in 3 changes cold water.
Make up solution consisting of Platino-Potassium, - 15 grs.
Phosphoric Acid, U. S. P., - - - ': oz.
- Water, - - - 15 ozs.
To tone, take - Platinum Solution, - I dram.
- Water, - - - S ozs.
Tone until proper shade is reached.
Wash in 4 changes and immerse ten minutes in Saturated Solution Hypo-sulphite Soda, '2 OZ.
Water, - S ozs.
'Wash ;4 hours in running water or in IS chang-es of water, not less than five minutes in each change.
NOTE.—Do not use the same tray for both gold and platinum baths Have one for each.
Prints must he thoroughly washed after coming ?rot, platinum bath and More fixing. Platinum is very acid. and it is necessary to entirely eliminate this lrom the prints, otherwise yon carry it into the Hypo bath, producing sulphurization and yellow spots.
Prints are better if washed by hand through ten or twelve changes of water, about five minutes for each change. Handle the prints well during that time. Do not let them mat together. When prints are washed they are ready to mount.