Van Gogh oil pastels are brilliant colours made with pure pigments, mineral oils, and wax binders for a remarkably soft and smooth laydown with no dust. 
Wonderful tinting strength and easy colour transfer. 
Suitable for use on various grounds and surfaces. 
This oil pastel stick of Ultramarine Violet 507.5 is formulated with pigments PV23/PB29 and has a lightfastness rating of +++ (at least 100 years lightfast under museum conditions).