File:The American annual of photography (1917) (14783608342).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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at will into intricate com-binations. Throw aside the fancied notion that Platinum is hard tohandle. If the negative be thin and soft print in the shadeuntil a slight image is visible; if of normal density, allow theaction of light to go a little farther. A few trials will deter-mine the depth of printing. The immersion in a solution ofneutral oxalate of potassium dissolved in sixty-four ounces ofhot water used room-warm followed by a bath in hydrochloricacid C.P one dram to eight ounces of water are hardly worthconsidering from the standpoint of difficulty. Leave the print in the oxalate until the desired tone isreached, clear for ten minutes or so, wash and dry. The in-structions accompanying Platinum paper are very comprehen-sive and easy to follow. Now make a try-out of the gum. Obtain from the druggistone ounce gum arabic m lumps and one ounce bichromate ofpotassium. Tie the gum in a piece of cheese-cloth; suspend ina wide-mouthed jar containing four ounces of cold water. Dis- 46
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ft. m H < H WW H 47 solve the bichromate in nine ounces of hot water. It will be aday or two before these chemicals are ready for use. Get asoft brush, preferably set in wood, three or four inches wide,and a tube or two of pigment, say ivory black and burnt umberto begin with. Into a flat dish squeeze out about two inchesivory black, or black and burnt umber, according to your choiceof tone, pour on two drams of the gum solution, blend thor-oughly, then stir in four or five drams of bichromate, mix welltogether and filter. Place several thicknesses of newspaper ona flat board, pin over this, by the four corners, a sheet of char-coal paper or a good quality linen writing-paper (minus watermarks) larger than the negative. Charge the brush, but nottoo fully, coat the . paper smoothly and quickly, firstwith downward strokes, then cross-wise; avoid streaks. Thesecret of the operation is a sure quick stroke that conies withpractice. Dry in a dark place. Now make a test ex-posure taking a

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