[2] Of this root, several varieties are imported. The white sort, which has no wrinkles, and no perceptible bitterness in taste, and which, though taken in a large dose, has scarcely any effect at all, after being pulverised by fraudulent druggists, and mixed with a portion of emetic tartar, is sold, at a low price, for the powder of genuine ipecacuanha root.
[3] Genuine ultramarine should become deprived of its colour when thrown into concentrated nitric acid.
[4] Genuine carmine should be totally soluble in liquid ammonia.
[5] Genuine madder and carmine lakes should be totally soluble by boiling in a concentrated solution of soda or potash.
[6] Genuine Antwerp blue should not become deprived of its colour when thrown into liquid chlorine.
[7] Genuine chrome yellow should not effervesce with nitric acid.
[8] The best Indian ink breaks, splintery, with a smooth glossy fracture, and feels soft, and not gritty, when rubbed against the teeth.
[9] Genuine white lead should be completely soluble in nitric acid, and the solution should remain transparent when mingled with a solution of sulphate of soda.
[10] Genuine vermilion should become totally volatilised on being exposed to a red heat; and it should not impart a red colour to spirit of wine, when digested with it.