The art of glass shewing how to make all sorts of glass, crystal and enamel : likewise the making of pearls, precious stones, china and looking-glasses : to which is added, the method of painting on glass and enameling : also how to extract the colours from minerals, metals, herbs and flowers ... : illustrated with proper sculptures / written originally in French, by Mr. H. Blancourt, and now first translated into English ; with an appendix, containing exact instructions for making glass-eyes of all colours.

CHAP. CCXXXIII. To purifie Linseed-Oyl.

THE use we have for Linseed-Oyl in our Cement, obliges us to give this Preparation, and way of purifying it, as we promised, whereby 'tis made more fit for our purpose.

Take good and clear Linseed-Oyl, of the colour of Saffron, and put it into a Glass, shaped like an Oxe-horn, with an Hole at bottom to let out the Water, which you must mix with the Oyl, letting them settle until the Oyl rises all up∣most; then open the Hole, and let the Water out, and the Oyl remain behind; then shake the Oyl again, with more fresh Water, let it settle, and the Water run out, as before; do thus eight or ten times, till the Water comes out as clear as it went in, and so the Oyl will be pure and fit for your use; keep it well stopt in a Glass-Bottle. If you can't get Linseed-Oyl, you may use Oyl of Bitter-Almonds, without purifying, for it needs none; but take notice, the Linseed-Oyl is best of any, tho cheaper than t'other.