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.
Cleaning Ferrotype Plates. It is absolutely necessary that the ferrotype plate be thoroughly cleansed with hot water each time it has been used. Polish with a soft cloth until plate is absolutely free from dirt or specks of any description. Next swab with a tuft of soft cloth or cotton batting wet in a solution composed of one ounce of benzine to 10 grains of paraffine. Rub dry with a clean cloth and polish with a chamois skin or very soft cloth. Use a soft camel's-hair brush to remove particles of dust or lint from the plate.
Placing Print On Ferrotype Plate. Lay the wet print face down on the ferrotype plate. It must be in perfect contact to produce an even, uniform glossy surface. By placing your ferrotype plate and enlargement into the tray of water and then placing the print on the ferrotype plate, while both are underneath the water, there will be less clanger of air-bells gathering and better contact is secured. When the print is in position on the ferrotype plate, remove both from the water, laying the plate on a perfectly smooth surface. With a squeegee or a rubber roller, expel any air-bells that might have gathered, at the same time removing the excess water. Light rolling is better than using a heavy pressure as the latter is liable to make the prints stick in spots. When the surface (in this case the back of print) is dry and while still on the plate, apply with your brush a thin solution of white glue. When bone-dry strip the print from the plate and lay the print on the mount, the face of which must previously have been well moistened with a wet sponge, and rub or roll down with a dry blotter. Then dry, face up, free from dust.
Coating Mounted Prints So As To Produce A Fine Gloss. A beautiful gloss may be given Enameled Bromide prints by coating the unmounted print with a solution of gum arabic:
Gum Arabic .......................................
When dissolved filter through chamois skin each time before using. Apply smoothly with a camel's-hair brush. If too thick to spread readily and smoothly, thin by adding water until you produce the proper consistency.
Spotting, Or Touching Up. Spotting should be done before squeegeeing, and the color used in spotting should be mixed with glue solution to which has been added a little alum. This will prevent the color from washing off. This spotting color, however, should be used warm. Remember that the ferrotype plates must have the highest gloss obtainable. The glue for mounting must be white and clean. Unless this kind of glue can be obtained it is advisable to use gelatine, which really is purer and better.
, Formula For Glue.
Best white glue or gelatine .................................
You will find this glue will keep almost indefinitely if you will add a little Carbolic Acid or Thymol. It must be heated for use, however. Soak the glue or gelatine in cold water for one-half hour, then heat to 110° Fahr. until dissolved. Strain through fine linen, when it is ready for use. Apply thinly and evenly to the print.
Caution. The print must be bone dry before stripping or it will not strip. The mount must be evenly moistened on the face with a wet sponge. If your mounts have lithographed India-tinted centers they should be rubbed with powdered pumice stone, to produce a surface that will cause the glue to stick, and they must be carefully dusted off before moistening.
735. The ferrotype plates must be cleaned with hot water each time before using.