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Aluminum reagent is also called Rose Red tricarboxylic acid triammonium, 3 - [bis (3-carboxyl-4-hydroxyphenyl) methylene] - 6-oxygen-1, 4-cyclohexadiene-1-carboxylic acid triammonium salt, lysoon, c.i.43810 (rose red tricarboxylic acid). Orange to brown glassy powder. The relative molecular weight is 473.43. Melting point 223-225 ℃ (decomposition). The absorption wavelength is λ Max 522nm. Insoluble in ether, acetone, chloroform, slightly soluble in ethanol, easily soluble in water. With aluminum, chromium, iron, beryllium can form a lake. This product has the structure of triarylmethane and has hydroxyl group and - NH4 group on the aromatic ring, so it has the function of color development.
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