... in- vestigators using zirconium or thorium lakes of alizarin or purpurin to detect the fluoride ion formed. ... aqueous phase titrated with thorium nitrate using sodium alizarin sulfonate as an indicator.7 In the hope ...

... containing 1 ml. of a 2 percent sodium alizarin sulfonate in- dicator. Total acid can be determined by neutralization of the absorption liquid to sodium alizarin sulfonate using 0.004 N sodium hydroxide solu- ...

... colouring matter of a beautiful red hue, called alizarin, mixed with some other colouring principles. When treated ... and named colorin. Colorin is chiefly formed of alizarin, fatty matters, and a small quan- tity of ...

... most interesting of the colouring substances is the alizarin of Robiquet and Collin. This is of an ... by precipitating a mixture of the solutions of alizarin and alum. Rochleder finds a close analogy between ...

... most interesting of the colouring substances is the alizarin of Robiquet and Collin. This is orange-red, ... by precipitating a mixture of the solutions of alizarin and alum. Rochleder finds a close analogy between ...

... powder termed garancin. Garancin yields to pure water alizarin (0UII]804,3II20), the red, neutral, crystallizable coloring-matter of madder. Alizarin does not exist ready formed in the plant, ...

... sulphate solution, shake, and allow to stand (?). 189. Alizarin, a Non-basic, Mordant Dye. In a test- ... of water and 5 c.c. of the alizarin suspension! (shake the bottle). Place in this the * ...

... powder termed garancin. Garancin yields to pure water alizarin (Cj4H10O4, 3H20), the red, neutral, crystallizable coloring-matter of madder. Alizarin does not exist ready formed in the plant, ...

... active reducing agents. DERIVATIVES OE ANTHRACENE. 429 Dioxyanthraquinone—Alizarin—C6H, C«H. —is the red pigment of the madder root (Rubia tinctoria). Artificial alizarin has now almost completely displaced the natural product ...

... in which, however, it is only sparingly soluble. Alizarin—C14HB04—240—a coloring matter prepared from anthra- ... the constitution of anthracene and the relation of alizarin to it are shown by the formulae : H ...