A new treatise on the modern methods of carbon printing by Marton A. M. (Albert Martin)

Author:Marton, A. M. (Albert Martin)
Language: eng
Format: epub
Tags: Photography -- Printing processes Carbon
Publisher: Bloomington, Ill.
Published: 1905-03-25T05:00:00+00:00

Soak and dissolve in the usual way, i oz. hard gelatine in i6 oz. of water; then add 25 grains of chrome alum dissolved in 2 oz. of hot water. Add the alum gradually and shake or stir well; should the solution become ropy, add a few drops of acetic acid to restore fluidity. Filter and apply with a brush or soft sponge. Should any air-bells arise take a strip of tissue paper and pass it over the surface, which will either break or bring them to one side.

Another splendid substratum is made of the following: Pure rubber, i dram; pure benzine, i pint. Filter before use, and flow over the plate like varnish.

To prepare the plates with this substratum, may seem somewhat lengthy and tedious; but in reality it does not take as much time, providing everything is conveniently arranged to do the work as it does to give a clear description of the process.

Plates prepared in this manner are easily handled, hold the film well during development, and may be prepared and kept in stock ready for use.

The following is another very simple and easy method of making double transfers. Perfectly clean glass or opal plates are well rubbed over with talc or French chalk, and then given an edge of insoluble gelatin (first wipe away an edge as above with alcohol) and then coated with the following insoluble gelatin substratum.

Gelatine (hard) 2 drams; water, 16 ounces; soak for an hour and dissolve by gentle heat, then add enough of the alkalin bichromate bath to give it a nice sherry color. Filter, and flow the prepared plates with this solution; drain off the surplus and place on a level stand until the gelatine has set; when dry expose them to a strong light for 5 or 10 minutes to render the film insoluble and the plates are ready for use. Instead of talc, waxing solution may be used, if

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