CHAP. VI.
Method of Engraving in Relief on the Shell of a new-laid Egg.
Chuse an egg that has a thick shell; wash it well in fresh water; then dry it very carefully with a linen cloth; this being done, put some tallow or fat in a silver spoon; then hold it on the fire; when the fat is melted and very hot, it will serve instead of ink for drawing with a new pen whatever you like. This being finished, you are to take the egg by the two ends between two fingers, and then lay it gently in a tumbler filled with good white wine vinegar; wherein, after remaining for three hours and an half, the acid of the vinegar will have eaten enough of the thickness of the shell; and as it cannot have the same effect on those places that are covered with the fat, all the drawing will have preserved its thickness, and will form the relief that is wanted, the operation sought for.
By this means one may draw on an egg a coat of arms, a mosaic piece, medallion, or any other design whatever.