142 
PRACTICAL PHOTO-MICROGRAPHY. 
accompany each bottle of the substance. We always 
use half a grain of bromide to each ounce of diluted 
developer. 
Both the ferrous oxalate and the amidol developers 
may be used repeatedly; in fact, it is a good plan to 
begin development with a solution that has been used 
before; if necessary to bring up detail or density a fresh 
solution may be applied later. 
If, after fixing, any marks of a “ scummy ” nature 
appear on the prints, an immersion in acid alum 
solution will remove them quickly; these marks are due 
to salts in the tap water combining with oxalate in the 
developer when that developer is used. Metol obviates 
even' kind of staining and marking that we have met 
with other developers. 
The washing must be thorough, as for other prints 
where hypo is used ; the same course may be followed 
as for gelatino-chloride paper. The squeegee should 
be freely used ; the film of bromide paper is, as a rule, 
not so tender as that of chloride papers. If a high 
gloss is desired on the prints when dry the same pro¬ 
cedure may be followed as that given for chloride paper 
on page 134. If the prints are allowed to dry spon¬ 
taneously on a piece of clean bibulous or ordinary paper 
the surface will be very pleasing and suitable. 
A very high gloss may be given by proceeding thus : 
Take a piece of good glass, free from surface imper¬ 
fections, clean it well with spirits and ammonia, or with 
a paste of whitening and water; then rub it all over 
with powdered talc—“ French chalk”—then rub all the 
