This is French sienna and is from the last remaining European company operating the ochre deposits in the quarries of Gargas and Rustrel nested in a 12 mile long enclave in the heart of the Luberon Mountains, the ochre country. Now I am betting Winsor and Newton don't source their pigments from such authentic places (or load their tubes which so much pigment).
This burnt sienna is a semi-transparent brown with good tinting strength, fine grained and brushes "long" in the direction of the brush stroke. A bit of pink undertone in there too!
|Colour Index:||Pigment Brown 7 (77491) (77492) (77499)|
|Chemical Name:||Natural Iron Oxide|