Titanium White: Reflecting 97.5% of all available light, this most opaque white is the perfect choice for direct painting. Monet would have loved it because he wanted his paintings to look soft, like velvet. The covering power of Titanium White is useful for creating opaque layers, but T-Z White is preferable for color-mixing.

Pigment: Titanium dioxide and a small quantity of zinc oxide (PW 6, PW 4)
Vehicle: Alkali refined linseed oil
Lightfastness I, Series 1, OPAQUE

reference: www.gamblincolors.com