7 FEBRUARY 1903, Page 3

A very interesting exhibition is now taking place at the

Holland Fine Art Gallery of works executed with M. Raffaelli's solid oil colours. The plan consists in mixing the dry powder colour with a very small quantity of oil and a certain amount of wax. A pastel is the result, but with this difference: the touches adhere firmly to the ground canvas or paneL Like pastel, the colours can be mixed together, but not so easily as with ordinary oil- colours. Therefore a large number of tints are made. Most of the colours are found in four gradations of paleness pro- duced by mixing the colour with white. These colours are not toys, but a serious contribution to the technique of the painter, and there seems no reason to doubt their permanence.