681. _To make Transparent Paper for Drawing._--Tracing paper is readily made by taking a sheet of very thin silk, or other paper, and rubbing it over gently with some soft substance, filled with a mixture of equal parts of drying oil, and oil of turpentine, which, being suspended and dried, will be fit for use in a few days; or it may be had at any of the shops. Lay this transparent material on the print or drawing to be transferred, and, with a sharp black lead pencil, trace the outlines exactly as they appear through the paper. If more permanent or stronger lines are wished, ink mixed with ox-gall will be necessary to make it adhere to the oiled surface. 682. _Transparent Paper._--Wet some fine paper with a feather on both sides with a thin layer of rosin, dissolved in spirits of wine. It will then serve to put over anything you wish to take off. 683. _Method of using Tracing Paper._--Take a piece of the size required, and rub it equally over, on one side, with black lead, reduced to a powder, till the surface will not readily soil a finger; then lay a piece of white paper with the leaded side of this paper next to it, under the print, and securing them firmly together with pins at the corners, proceed to take the outlines with a blunt point, and some degree of pressure, which will transfer the lead to the clean paper precisely in the direction the point passed over the print; this may be corrected with the black lead pencil, and cleansed of any soil by the crumbs of stale bread. 684. _Method of setting Pencil Drawings._--A solution of alum water, in which the drawing is to be dipped (not washed on with a brush, as it would smear) will answer the purpose extremely well. 685. _Wash for preserving Drawings made with Black Lead Pencil, or with hard Black Chalk._--A thin wash of isinglass will fix either black lead or hard black chalk, &c., so as to prevent their rubbing out; or the same effect may be produced by the simple application of skimmed milk. The best way of using the latter, is, to lay the drawing flat upon the surface of the milk, and then, taking it up expeditiously, to hang it by the one corner till it drains and dries. The milk must be perfectly free from cream, or it will grease the paper. 686. _To make Red Sealing Wax._--To every ounce of shell-lac take half an ounce each of resin and vermilion, all reduced to a fine powder. Melt them over a moderate fire; and when thoroughly incorporated and sufficiently cool, form the composition into what are called sticks. On account of the dearness of shell-lac, seed-lac is usually substituted. A more ordinary sort, but sufficiently good for most occasions, may be made by mixing equal parts of resin and shell-lac with two parts of red lead and one of vermilion. In a still commoner sort, the vermilion is often entirely omitted. MARKING INK.