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alizarin| A red dye formerly extracted from madder-root. It is now prepared synthetically from anthracene. Alizarin crystallizes in dark red prisms and sublimes in orange-coloured needles, melting at 290°C/554°F. It is almost insoluble in water, but dissolves in alcohol. |
| It yields with metallic oxides magnificently coloured insoluble compounds called ‘lakes’, to which it owes its great value for dyeing purposes. Ferric oxide with alizarin gives a violet-black compound, chromium oxide a claret, calcium oxide a blue, and aluminium and tin give different shades of red. |
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