212. The gold toning bath should be made up from 10 to 12 hours before using. Add enough gold to keep speed of bath 6 to 8 minutes. Do not make the bath too strong, as the print will tone before the whites clear up. The manner of testing the bath and the methods of toning are identical with the preceding instruction.

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

..... 60 Ozs...

Aristo Platinum..........................

3 to 5 drms.

Add platinum enough to keep the speed of the bath from 6 to 8 minutes.

214. The formula gives 60 ounces of water and three to five drams platinum solution. Of course, it depends on how many prints there are to tone. The best method to follow will be to place enough water in the platinum toning tray adding about three drams of platinum solution at the beginning. The speed of this bath should be from six to eight minutes. If necessary, add more platinum until you get the speed, as it is platinum and not water that tones.

215. A print slightly toned in the gold bath will take more time and more platinum to tone in the platinum bath. If a print is left very warm in color in the gold bath and toned very far in a strong platinum bath, it will take on a strong olive tint, as overtoning with platinum gives greenish or olive-black tones. If you tone to a purple and deposit plenty of gold on the print, it takes less platinum and time to tone, and the result is a pure black.

216. After the prints have been toned in this platinum bath according to the preceding general instructions for platinum toning, they should be thoroughly washed and fixed in the fixing bath previously recommended and afterward handled over and over in this bath for 20 minutes. They should be washed by hand through not less than 12 changes of water for a period of one hour. Aristo Platino and Aristo Jr. can be washed and toned together in the same gold bath.

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

.64 ozs.

Salt...........................................

..30 grs.

Aristo Gold No. 2.............................

2 drms.

Sufficient borax (saturated solution) to turn red litmus paper blue in two minutes.

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

.60 ozs.

Salt...........................................

.30 grs.

Acetate of Soda (Sat. Sol.)................................

..1/2 oz.

Aristo Gold No. 2.............................

.1 drm.

Place in the bath a cabinet size piece of platino paper and allow to stand over night.

219. When ready to tone add one dram Aristo Gold No. 2 which ought to make the speed of the bath six or eight minutes. Make the bath alkaline by adding enough of the saturated solution of borax to cause fresh red litmus paper to turn blue in two minutes.