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Composed of ground mineral Vivianite, the color is a deep greyish-blue; lightfast and semi-opaque with a slight texture when painting. Vivianite is a soft blue mineral pigment composed of ferrous phosphate. Fresh Vivianite mineral crystals are colorless but oxidizes easily when exposed to light which develops into a deep blue. Vivianite can be found inside fossil shells, like ancient mollus. . . Read More >