713. Bright Blue Tones

Bright Blue Tones. A bright blue tone can be obtained with the following bath:

Formula.

Iron Alum ............................

10

grs.

Potassium Ferricyanide ............................

4

grs.

Hydrochloric Acid .............................................

10

minims

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

10

ozs.

After developing and fixing, immerse the prints in this toning bath until the desired color is obtained and then wash well. If the prints are subsequently fixed (returned to the Hypo Bath) a more transparent blue is obtained.

714. Greenish Blue And Green Tones

Greenish Blue And Green Tones. By treating the blue toned print with the following bath for a short time, greenish-blue or green tones are obtained:

Sodium Sulphite ........................

1

gr.

Hydrochloric Acid ............................

1

drop

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

20

ozs.

Care must be taken not to leave the print in this bath too long or it will turn black.

715. Deep Blue Tones

Deep Blue Tones.

Iron Alum.................................

12 1/2

grs.

Potassium Ferricyanide ....................

10

grs.

Oxalic Acid - sat. Sol. ...........................

30

minims

Ammonium Alum-Sat. Sol..................

50

minims

Hydrochloric Acid .........................

25

minims

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

10

ozs.

Place the print in this bath until the desired tone is reached and then wash carefully.

716. Green Tones

Green Tones.

Vanadium Chloride ................................

2

grs.

Ferric Chloride................................

1

gr.

Ferric Oxalate................................

1

gr.

Potassium Ferricyanide's.......................

2

grs.

Oxalic Acid-Sat. Sol..........................

2

drs.

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

4

ozs.

Mix the iron salts with the Ferricyanide and acid in water. Dissolve the Vanadium with 2 or 3 drops of Hydrochloric Acid and boiling water and add to the other salts. Immerse the print in this bath until the high-lights are a slate blue and then wash until green.

717. None of these blue or green tones can be considered absolutely permanent, although they will stand for quite a long time. The least permanent tones are those obtained in baths containing Vanadium.