the full tone. A wash of half an
hour will remove the salts left in the film.

Granted that bleacher and sulphide are in proper working order, there is
one further factor in the making of sepia prints which is of vital
importance, and that is the proper preparation of the print itself. A good
sulphide tone presupposes a good black and white bromide. Not only that,
defects in the bromide which may lie latent while the print is untoned
come to light in the sulphide bath. This applies to uneven fixation (due
to omission to keep prints moving in the hypo bath) and fingering of the
surface; while, as regards the original development of the print, making
the best of a wrong exposure will not do when sulphide toning is in view.
A print that is forced by long development will suffer in tone, the result
being colder and less satisfactory as regards vigor. Full exposure, and
development which is complete in the normal time for a perfect black
print, are the conditions for a good sepia tone, and, when a batch of
prints is being put through, it is well to take steps to preserve a
uniform time of development in order to secure an identical tone
throughout.

There are many different formulas for the uranium toning of bromide
prints, and I suppose that most of them have given good results with the
workers who published their methods. Of those which I have tried, however,
none has yielded the results which I have been enabled to obtain from my
own formula--my own in that I arrived at it by patient experimenting. It
may be that this formula is not wholly original with myself. At any rate,
I do not claim anything for it except that it works, with me, better than
others I have tried.

The requirements for toning bromide prints with uranium are: 1 ounce of
uranium nitrate; 1 ounce of potassium ferricyanide (the red crystals); 1/2
pound bottle of acetic acid--c. p. glacial preferred; water; a supply of
blotting paper, to be kept exclusively for this purpose, and a few
absolutely and chemically clean trays.

The expense attached to these toning processes is slight. Uranium nitrate
costs from forty to sixty cents per ounce, and an ounce will last a long
time. Potassium ferricyanide costs about twenty cents per pound, and a
pound is ample for a lifetime. Glacial acetic acid is a little more
costly, but a half-pound bottle will prove a good investment. It is used
also, as the reader will recall, in making acid hypo for acid fixing.

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