W&N Griffin Alkyd 37ml – Permanent Sap Green (Series 2) Following the popularity of acrylic colours, which dry in 10-20 minutes, oil painters began requesting a product which dried faster than traditional oils. Winsor & Newton responded in 1976 by developing a range of alkyd colours, which has today become Griffin Alkyd Fast Drying Oil Colour. Alkyds are made from a naturally derived vegetable oil that is polymerized. The result is a resin-like product that, when mixed with a solvent, is very similar to traditional linseed oil. The colours remain workable for 4 to 8 hours and are touch dry in 18 to 24. Consistent drying times across the range removes the usual restrictions that come with conventional oils, making it easier to overpaint, regardless of the colour upon the surface.