CHAPTER XVIII.

PRINTING ON PLAIN PAPER.

Prints on plain paper are sometimes of use; for instance, they form an excellent basis on which to colour. They are of course duller than an albumenized print, since the image is formed more in the body of the paper than on the surface. The following formula may be used:--

Ammonium chloride 60 to 80 grains Sodium citrate 100 " Sodium chloride 20 to 30 " Gelatine 10 " Distilled water 10 ounces

Or,

Ammonium chloride 100 grains Gelatine 10 " Water 10 ounces

The gelatine is first swelled in cold water, and then dissolved in hot water, and the remaining components of the formulæ are added. It is then filtered, and the paper is floated for three minutes, following the directions given on page 10. If it be required to obtain a print on plain paper in a hurry, a wash of citric acid and water (one grain to the ounce) may be brushed over the back of ordinary albumenized paper, and, when dried, that side of the paper may be sensitized and printed in the ordinary manner. For cold tones the wash of the citric acid may be omitted.

The toning and fixing are the same as described in Chapters XII. and XIII.