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This must be curiously done without any soiling, and there∣fore you must be cautious of letting any dirty thing come near, whilst you are doing it.
To begin this Work, scrape as much Isinglass as will make it of a reasonable thickness, or when dipping your Pencil into
it, it will with a stroke whiten the Body which has been passed over with a Brush, but let it be in neither of the extreams, too thick or too thin, then mix it with your Size, whiten your Work over with it, and when dry, repeat the same, covering it from all manner of Dust be∣fore it is Varnished; it must be whited three times, and dried between every one of them, smooth, and lay it as close as you can to the Wood with your Rushes; then mix White Flake with your Size, only so that it may lye with a full and fair bo∣dy on the Piece, and whiten your Work three several times, with this drying between each, then make it with your Rushes very smooth, but keep your di∣stance from the Wood.
In the next place, take white Starch boiled in fair Wa∣ter
till it come to be somewhat thick, and when it is luke∣warm, wash over your Work with it once or twice, drying between whiles, and let it then stand twenty four hours, then take the finest of the white Var∣nish I have directed you to make, wash your Pencil in Spirits, and wash or anoint your Work six or seven times, and after thirty or forty hours, do the like again, and if done with a dexterous hand, a better gloss will be set on it than if it had been Pollished; but if it miss of that gloss, it is requi∣site that you Pollish it; and in order thereto, you must accom∣modate it with five or six washes of Varnish more than the for∣mer, and it must continue to settle well about a Week before you Pollish it.
In Pollishing, your Linnen
and Tripolee must be of the fi∣nest, being neat and careful in all this operation, your hand carried light and gentle, having your cloth neither too dry nor too wet, and clear it up with fine Flower and Oil.