PEARLS, TO CLEAN: See Cleaning Preparations and Methods.
PEGAMOID.
Camphor, 100 parts; mastic, 100 parts; bleached shellac, 50 parts; gun cotton, 200 parts; acetone, 200 parts; acetic ether, 100 parts; ethylic ether, 50 parts.
PEN METAL: See Alloys.
PENCILS, ANTISEPTIC: See Antiseptics.
PENCILS FOR MARKING GLASS: See Etching, Frosted Glass, and Glass.
PENS, GOLD: See Gold.
PEONY ROOTS, THEIR PRESERVATION: See Roots.
PERCENTAGE SOLUTION.
Multiply the percentage by 5; the product is the number of grains to be added to an ounce of water to make a solution of the desired percentage. This is correct for anything less than 15 per cent.