Alum 1/2 lb.
Citric Acid 2 oz.
Water 1/2 gal.
Keep this solution in a flat dish, and after the plate has been
washed from the hypo put it in this solution for two or three
minutes; if there are any remaining traces of hypo in the film it
will be decomposed, the film will be hardened and freed from color;
when this is accomplished wash again and set the plate up to dry.
While the alkaline pyro developer is the best and gives the finest
printing quality to negatives, there are many who prefer (for other
reasons) the