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Another Method still better
Take one ounce of the best isinglass, dissolve it in about a pint of water by simmering it over the fire; strain it through fine muslin, and keep it for use.
Try the size on a piece of paper, (heat it to a moderate heat,) and if it glistens it is too thick; then add more water, if it soaks into the paper it is too thin; add or diminish the isinglass till it merely dulls the surface; then take your drawing, and give it two or three coats, being careful (particularly in the first coat) to bear very lightly on the brush, (which should be a flat tin camel's hair,) and plenty of size to flow freely from it, otherwise you may damage the drawing.
Then take the best mastic varnish and give it at least three coats, and the effect will answer your most sanguine wishes.
Note. -- This is the method used by many eminent artists and is found superior to any that has been tried.