PRINTING ON BROMIDE PAPER. I4I 
creasing the proportion of iron ; over-density may be 
met by giving long exposure and lowering the proportion 
of iron ; bromide also helps to procure contrast in the 
print; but an overdose of bromide is apt to lead to 
ugly greenish tones. 
Over-exposure leads to poor images, usually of this 
greenish tone ; under-exposure results in crude chalky 
images, dense black in the shadows, and undeveloped 
in the high lights. 
The negative is laid face up in a printing frame, the 
paper face down on the negative, and the frame moved 
evenly in front of the light. After exposure the paper 
is soaked, till it is limp, in pure water ; the developer is 
then poured on, the water having been rejected; the 
image should not come up for twenty or more seconds ; 
the details should appear one after the other, and 
density should grow along with the details. When the 
shadows have taken a good plucky colour—-perhaps 
after three or four minutes—the print is at once to be 
washed in water acidulated with acetic or hydrochloric 
acid ; if the water smell of acetic acid the acidulation 
is enough ; this is used to ensure elimination of the iron 
which might be precipitated in the paper and cause a 
yellow stain. The print is now to be washed well in 
plain water to eliminate the acid, and is at once fixed 
in hyposulphite of soda one part, to water hve parts, by 
weight. The development must not be allowed to go 
too far, for the print appears darker after fixation than 
before it. 
Instructions for making the amidol developer 
