| http://www.w3.org/ns/prov#value | - According to one embodiment, the water-insoluble inorganic substance can be produced synthetically or can be of mineral origin, and in particular is selected from the group comprising: - metal oxide, for example zinc oxide, iron oxides, titanium dioxide (solar), chromium oxides, bismuth oxychloride, sulpho-silicates and mixtures thereof - phosphate minerals, for example hydroxyapatite; - silicate
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