CHAPTER XIV. 
PRINTING ON BROMIDE PAPER. 
HIS is probably the best printing process for the 
A photo-micrographer, but a certain amount of 
practice is required before good and even results can be 
expected. The general procedure is this : The paper 
is exposed to light, generally artificial, in contact with 
the negative, and the image is developed with ferrous 
oxalate or other suitable developer. The bromide 
paper consists of very pure paper coated with an 
emulsion of gelatino-bromide of silver of much less 
sensitiveness than an emulsion used for negative¬ 
making ; we may use a fairly bright yellow light during 
development, but the window or lamp should be pro¬ 
vided with yellow fabric or paper; ordinary yellow 
glass is unsafe. The paper known as “canary medium” 
answers well, or two layers of “ golden fabric.” 
Paper should be used having on it a slow emulsion ; 
the bromide papers frequently found on the market are 
too sensitive for the best results ; the paper recom¬ 
mended is the “ Permanent ” of the Kodak Co. The 
tone to be aimed at should be good black, similar to 
