NEW COMPOUNDS OF GALLIUM. PART V. GALLIUM ALIZARIN LAKES. GALLIUM SALTS OF GEOMETRICALLY AND OPTICALLY ISOMERIC ACIDS AND DOUBLE SULPHATES WITH ETHYLENE- AND PROPYLENEDIAMINE SULPHATES.

Gallium alizarate and gallium-calcium alizarate have been obtained. These 'lakes' are red in colour, the million lake being as-scarlet as the corresponding aluminium compound and the calcium-gallium lake dull red in colour. These can be fastened on cattail, woolen and silk fabrics. Other salts prepared are d- and I-gallium camphor sulphonates and their optical rotations have been measured. Ethylene-and propylenediammonium gallium sulphates also been prepared