There are several well-known papers sold; Rive's, which is a French paper, has a high glaze and fine surface; the Saxe, which is more uniform in its texture, is made in Germany. Another maker is Tow-good. Positive paper is albuminized by placing it in a mixture composed of white of eggs and salt. To the white of each moderate sized egg use 15 grs. of common salt reduced to a fine powder; whisk until the albumin is all white froth. Leave this froth in a glazed earthen pan for about 12 hours, by which time most of it has settled into clear albumin; pour the clear portion into a flat porcelain tray. This tray should be somewhat larger than the sheets of paper to be albuminized. Lift the paper up by the ends and lay it carefully on the albumin, keeping the side marked as "inferior" uppermost and dry. The paper should be slightly damp before it is thus treated, as it then takes the albumin more regularly, and is not so liable to air-bubbles. The paper must be lifted at each end, and should any air-bubbles appear, brush them off with a card or small brush, replacing the paper in the bath. Wherever the albumin does not come into actual contact with the paper, a white mark will appear in the print. Remove the paper from the bath and place it to dry on a cardboard frame, or suspend it at the corners by clips. Paper glazed with pure albumin acquires too brilliant a glaze for portraits; the albumin may be diluted with from a 1/4 to 1/3 its bulk of water. It should be kept in tin or zinc cases.