Until now acrylic paints have darkened in tone as they dry, making colour matching difficult, so artists have to remember to allow for this when mixing wet colors. However with Winsor & Newton Artists' Acrylic, acrylic painters no longer have to cope with color shift. With Winsor & Newton Artists' Acrylic, what you see is what you get. Color shift is due to the binder changing from white to transparent as it dries. As the white emulsion dries within the color and becomes clear, the paint becomes more transparent and therefore darker. This causes problems when you are returning to a painting that is already dry or if you are trying to match a dry mix, because you only have the dry mixture to compare it to. Thanks to their expertise in color making and resin technology, Winsor & Newton has developed a new unique binder that is translucent when wet and dries clear. It is this that ensures there is virtually no shift in color at all - any change in color between wet and dry is equal or less than the equivalent colors in Artists' Oils.