This section is from the book "Complete Self-Instructing Library Of Practical Photography", by J. B. Schriever. Also available from Amazon: Complete Self-Instructing Library Of Practical Photography.
Toning. Proceed to tone your prints in this bath by handling them exactly as you were previously instructed. The prints should tone in from 6 to 8 minutes. If they tone more slowly, add more platinum. Pay no attention to the bronzing of the prints in the shadows, as this will disappear when the prints are completely toned. Tone the prints until the desired color is reached.
Washing. After prints are toned wash in four changes of clear water. In the second water, after toning, add a few drops of saturated solution of carbonate of soda. The carbonate of soda being strongly alkaline, kills the action of the acid which was carried into the wash waters from the platinum bath.
Fixing. Fix prints in the hypo bath, 18 hydrometer test, for 20 minutes.
Salt Bath After Fixing. After fixing place the prints in salt water, 2 ozs. salt to a gallon of water, picking them over and over for 10 minutes. After this wash and dry in the usual manner.
438. The platinum bath can be used over and over again by using one-half old bath and one-half fresh water, adding enough platinum to make the speed of the toning 6 to 8 minutes. The best results are generally obtained when using part old bath.
Coffee Tone. A very rich brown tone can be obtained on matte surface, or collodio carbon paper, by printing the same as you would for black and white prints and washing in the usual way. Tone first in your regular platinum bath, omitting the gold bath entirely. After toning, fixing and final washing, place them in a bath of strong coffee. The coffee of course must be used cold. Allow them to remain in the bath until the desired tone is obtained, which will require from 10 to 20 minutes. After toning, wash in one change of water and dry between blotters, or if light weight matte surface papers are used lay the print on glass and back it up with backing paper. When dry the prints can be cut off the glass and they will lay perfectly flat.