OPEN Acrylics feature uniquely relaxed working characteristics and a remarkable ability to resist skinning and remain wet on the palette during long painting sessions. Working time varies according to how thickly the material is applied. Thin applications tack up, allowing additional layers to be applied and blended. Thicker applications may be worked for hours. This 6-color set includes Indian yellow hue, alizarin crimson hue, ultramarine blue, sap green hue, Van Dyke brown hue and titanium white in 22ml tubes and an OPEN Application Guide.