1 | Appearance | A white, crystalline powder. | A white, yellowish or slightly pinkish, crystalline powder. |
2 | Solubility | Complies | Practically insoluble in water, very soluble in methylene chloride, freely soluble in alcohol and in fatty oils. It dissolves in dilute solutions of alkali hydroxides. |
3 | Identification A (By TLC test) | Complies | The principal spot in the chromatogram obtained with test solution (b) is similar in position, colour and size to the principal spot in the chromatogram obtained with reference solution (a). |
4 | Identification B (By Chemical test) | Complies | After separation, the organic layer is red. |
5 | Identification C (By Chemical test) | Complies | A red colour develops. |
6 | Appearance of Solution | Complies | Solution is clear and not more intensely coloured than intensity 5 of the range of reference solutions of the most appropriate colour. |
7 | Related substances By TLC (3-(1,1-Dimethylethyl)-4-methoxyphenol) | Less than 10.0% | Not more than 10.0% |
8 | Related substances By TLC (Hydroquinone) | Less than 0.2% | Not more than 0.2% |
9 | Related substances By TLC (Any other impurity) | Less than 0.5% | Not more than 0.5% |
10 | Sulphated ash | 0.005% | Not more than 0.1% |