The islands have large (unworked) supplies of pumice, sandstone, sulphur, gypsum, alum and mineral-paint ochres, and some salt, kaolin and sal-ammoniac, but otherwise they are without mineral wealth other than lava rocks for building purposes. [Please select]
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The older types of colouring matter--such as cadmium yellow, ochres, vermilion, umbers--have been superseded. [Please select]
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