₹ 20/Kg
- C.I.Number: 77492
- Usage/Application: Wood Polish , Paint
- Product Type: Powder
Sienna is a clay containingiron oxide, calledlimonite, which in its natural state has a yellowish colour. In addition to iron oxide, natural or raw sienna also contains about five percent ofmanganese oxide, which makes it darker than ochre. When heated, the iron oxide is dehydrated and turns partially tohaematite, which gives it a reddish-brown colour.[5]Sienna is lighter in shade than raw umber, which is also clay with iron oxide, but which has a higher content of manganese