| Red prussiate of potash | 1 " |
| Water | 4 " |
Keep the bottles in a dark place or wrapped in black paper. Mix equal parts of No. 1 and No. 2, and having first dampened the paper with a brush or sponge put on enough of the solution to tint the paper evenly and apply lightly to avoid streaks. As soon as the paper is dry it is ready for use. The operation of sensitizing the paper must be done by gas or lamp light.
Sir Knight Frank S. Whitney asks how to mount prints made on Omega paper without removing the gloss, and also wishes a good formula for paste, and to know just how mounting of prints is done. Trim the prints ready for mounting before they are toned. Tone them, and squeegee them to the ferrotype plate. When they are thoroughly dry apply paste to the back of the print before removing it from the ferrotype. This will moisten the print just enough to let it be removed from the plate without tearing or sticking, loosening the corner first with the point of a pen-knife. Have the card-mount ready, and lay the picture carefully on it just where it is to be pasted. The prints treated in this way lose little of the gloss made by the ferrotype plate. When first beginning to mount pictures it is best to mark the place on the card where the picture is to be pasted. Lay a piece of tissue-paper over the face of the print, and rub the squeegee over it lightly. Take off the paper, and if any paste has oozed out from the edges of the print, wipe it off carefully. Then lay a fresh piece of paper over the print and rub down smoothly. If one has no squeegee, a smooth glass bottle answers well for small prints. For a formula for good paste see No. 784.
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