Water, 1/2 gal.
Alum, 1/4 lb.
Citric acid, 2 oz.
Allow the plate to remain in this solution a few minutes and it will
be found to have been greatly improved, having lost the color and
cleared the shadows. This solution, besides clearing the negative,
decomposes the hypo remaining in the film, and a short wash after
being taken from it is sufficient.