European perennial herb (Alkanna tinctoria) having cymes of blue flowers
and red roots. The red dye extracted from the root. Plants of the
Eurasian genus Anchusa, having blue or violet flowers grouped on
Univalent, unsaturated organic radical C3H5.
Bitter, yellow crystalline compound from aloe, used as a laxative.
Double sulfates of a trivalent metal such as aluminum, chromium, or iron
and a univalent metal such as potassium or sodium, especially aluminum
potassium sulfate, AlK(SO4)2 12H2O, widely used in industry as
clarifiers, hardeners, and purifiers and medicinally as topical
astringents and styptics.