Rublev Colours Pigment Italian Yellow Earth - 100 g

Italian yellow earth is a natural earth containing clay tinted by hydrated iron oxide and is composed of goethite and traces of clay, gypsum, or manganese carbonate. Historically, yellow earth was designated by the mineral name limonite. Limonite is not a true mineral but a general term used to describe all forms of hydrated iron oxide minerals (α-FeOOH) that occur as natural earth. Limonite includes the minerals goethite, akaganeite, and lepidocrocite. The names of yellow iron oxide pigments are confusing. The names earth and ocher are suitable when it is clear that the pigment comes from a natural source. Earth is a more general term since ocher refers to a specific type of iron oxide deposit containing kaolin (clay) and quartz. For example, iron oxide content must not be less than 12% to be considered an ocher. Depending upon the hydrated iron oxide's content, the ocher's color varies from light yellow to orange-red. Like red iron oxides (hematite), they are found worldwide and have been used as pigments since prehistory. French ocher, historically one of the best grades of limonite, contains about 20% iron oxide and is high in silica.

WARNING: Exercise care when using dry pigments. Do not eat, drink or smoke. Avoid breathing dust. Use a NIOSH-certified dust respirator. Wash hands immediately after use. If the creation of dust is likely, wear protective clothing.