Albumenised printing-out paper is made by coating a suitable paper with albumen containing a soluble chloride. Rives paper is generally employed, and what is known as 10 kilo should be chosen. Most of the albumen used commercially for this work is obtained from the blood of animals, but a small consumer will find egg albumen more suitable. The albumen of one egg will coat; two sheets of paper, but to cover the dish that must be used to the deptli of about i in., about twenty eggs will be required. The paper may be coated in quarter sheets. The whites of the eggs must be thoroughly separated from the yolks, no trace of the yolks being in the coating solution. Tap the shell on the edge of a cup to crack it, hold the crack uppermost, and, placing the thumbs in the crack, pull in two and pour the yolk from one half shell to the other. While this is being done, the white will of itself fall into the cup below. Pour the whites one by one into a deep vessel, add 8gr. per ounce of ammonium chloride, and beat to a froth with an egg whisk or a bundle of quill pens.

Allow the mixture to settle till next day, filter through fine muslin, pour into a flat dish, and, to coat the paper, which is more easily done if it is slightly damp, float it on the solution, lowering the paper at one corner, and pushing it forward along the dish until the whole surface is in contact. Care must be taken to avoid air bubbles, as such spots cannot be sensitised. If the paper is at all dry it will curl back off the solution. The paper may be tinted with Judson's dyes, if desired. For double albumenised paper, immerse after the first coating in a solution of i parts methylated spirit and 1 part water, then give a second coating of albumen. The paper is sensitised just before use by floating on a solution of silver nitrate 50 gr. to the ounce.