695. Cold Hypo Toning Bath

Cold Hypo Toning Bath. The cold hypo toning bath is especially adapted for the Eastman Royal Bromide, Enamel, and Matte-Enameled Bromide papers. By preparing this bath according to instructions beautiful, rich brown and sepia tones can be easily obtained.

Hyposulphite of Soda ............................

10

ozs.

Ground Alum.................................

2

ozs.

Boiling Water.................................

1

gal.

First, dissolve the hypo in the hot water. For this, only enough water need be heated to dissolve the hypo. Then add the alum slowly, stirring vigorously. When all is dissolved the solution should appear milk white. The older the solution, the better it works.

696. To Tone

To Tone. After the prints are developed and fixed-and we would say here that the prints must be thoroughly fixed before toning-wash in three or four changes of water and then place in the cold toning bath, sliding the prints, face side down, under the solution, thus avoiding air-bells. When toning several prints slide them one by one underneath the first print immersed. The print, or prints, should be handled over occasionally during the first four or five hours, and may then be left in the bath over night, or until the desired tone is acquired.

697. After toning, wash thoroughly for two hours, when they are ready to dry. They should always be toned face down. This solution can be used repeatedly by adding a fresh bath at frequent intervals. A number of prints can be toned at the same time. Spots or unevenness of tone will disappear if the print is left in a bath and frequently moved. The toning takes from fifteen to twenty hours. By heating the bath the toning can be hastened. Care should be taken, however, to keep the prints moving in the heated bath, to prevent the formation of air-bells.

698. A yellow tone instead of a sepia is caused by the water not being sufficiently hot when the bath was first made up. It is absolutely necessary to have it hot, because the hot water frees the sulphur from the hypo and produces sul-pliurization.

699. A Rapid Sepia Toning Bath

A Rapid Sepia Toning Bath. The following formula gives a much more rapid toning bath; tones can be obtained with it in about 20 minutes. You must bear in mind, however, that a fresh bath tends to reduce the print and also gives a more yellow tone. Old baths give dark and colder (almost purple) tones. All prints dry with a slightly colder tone. No matter how long such a bath has been used it should never be thrown away, but some of it, at any rate, mixed with the fresh bath, so as to give age to the latter.

Hypo....................................

3 1/2

ozs.

Water ........................................

20

ozs.

Powdered Alum ......................................

130

grs.

To' this add 30 grains of Nitrate of Silver.

700. Dissolve the Nitrate of Silver in a little water before adding. Heat this bath to 120° Fahr. and allow it to cool. Prints should receive two or three changes of water after fixing, and then place into this toning bath. While the prints are in the toning bath again heat the bath to 120° Fahr.

701. The first formula, although it is much slower, gives the better results, and we, therefore, recommend its use.