86. Prints Discoloring Or Fading In Spots

Prints Discoloring Or Fading In Spots. This is due to the use of impure paper, or paper which is not free from chemicals which have a deteriorating effect on the coating.

87. Print Flat Or Sunken In Appearance

Print Flat Or Sunken In Appearance. Paper insufficiently or unevenly sized. The paper should be kept in the sizing and salting bath not less than two minutes. If the salting bath is applied to the surface of the paper with a swab of cotton flannel, great care must be taken that the solution is evenly distributed; otherwise irregular streaks will show in the print.

88. Paper Curling When Floating On Salting Bath

Paper Curling When Floating On Salting Bath. Caused by paper being too dry. It should be well dampened before salting.

89. Paper Printing Weak

Paper Printing Weak. Too weak a solution of silver nitrate. Sensitizing bath should test GO grains of silver to the ounce of water, and never less than 40 grains.

90. Paper Darkening While Still Fresh And Before Use

Paper Darkening While Still Fresh And Before Use. Lack of citric acid in the sensitizing bath.

91. Print Appears Weak After Fixing

Print Appears Weak After Fixing. Insufficient exposure. The paper must be considerably over-exposed, as the image weakens considerably in the fixing bath. Too strong a fixing bath will also cause the prints to bleach.

92. Prints Turn Yellow After A Time

Prints Turn Yellow After A Time. If the prints have not been properly fixed and very thoroughly washed, they are liable to turn yellow in a very short time.