151. Preparing the Stock Solution.

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

4 Ozs.

Chloro-Platinite.................................

.. .15 grs.

Phosphoric Acid (50% Solution)..................

2 1/2 drms.

Keep this solution in a well stoppered bottle and in a dark place.

152. Preparing the Platinum Toning Bath.

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

.30 ozs.

Platinum Stock Solution.....................................

6 drms.

It is advisable to prepare this bath at least one hour before toning.