The insoluble salts are rose-red or violet in colour.
It is insoluble in water, while its salts are readily soluble.
Arsenic is insoluble in the acid, but immediately dissolves in the bleaching-powder.
Certain substances, such as the precious metals, are quite insoluble in the bead, but float about in it.
Certain substances are insoluble in all these reagents, and other methods, such as the fusion with sodium carbonate and potassium nitrate, and subsequent treatment with an acid, must be employed.