Persian Berries. The dried unripe fruit of various species of Rhamnus. Also called French berries, grains of Avignon.
Potassium Carbonate. (Potashes.) Carbonate of potash has been known since ancient times as a constituent of the ashes of land plants, from which it is obtained by extraction with water. In most cases Sodium Carbonate, which it strongly resembles, can be used in its place.
Red spirits. Tin Spirits. Applied to tin mordants generally. A solution of Stannous chloride.
Red woods. Camwood, Barwood, Sanderswood (Santal, Sandal, Red Sanders), Brazil wood, Sapan wood, Peach-wood.
Roucou. Anatta, Arnotto.
Saxon blue. The dye made by indigo dissolved in oil of vitriol.
Scotch ell. 37.2 inches.
Scour, to. To wash.
Scroop. The rustling property of silk.
Soda ash. Carbonate of soda.