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In this way he discovered that light substances were attracted by alum, mica, arsenic, sealing-wax, lac sulphur, slags, beryl, amethyst, rock-crystal, sapphire, jet, carbuncle, diamond, opal, Bristol stone, glass, glass of antimony, gum-mastic, hard resin, rock-salt, and, of course, amber.
VARNISH FOR FANS. To make a varnish for fans and cases, dissolve two ounces of gum-mastic, eight ounces of gum-sandaric, in a quart of alcohol, and then add four ounces of Venice turpentine. When melted, add half an ounce of mercury; and when perfectly combined, take the mixture from the fire and cool it.
Mix the isinglass and gum-mastic together, adding 1/4 of an oz. of finely-powdered gum-ammoniac; put the whole into an earthen vessel and in a warm place, till they are thoroughly incorporated together; pour it into a small bottle, and cork it down for use. In using it, dissolve a small piece of the cement in a silver teaspoon over a lighted candle.
Dissolve 1 oz. of gum-mastic in a quantity of highly-rectified spirits of wine; then soften 1 oz. of isinglass in warm water, and, finally, dissolve it in alcohol, till it forms a thick jelly.
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