Golden Heavy Body colors retain their clearest and cleanest quality, especially when used in washes or glazes. It is always possible to add matting agents and other whitening materials to the product, but once added, it is impossible to take them away. The Heavy Body line of acrylics contains no additional flattening agents, opacifiers or other solids that might interfere with the clarity of our pigments.The Neutral Grays in the Heavy Body line are a series of achromatic grays. Achromatic grays allow artists to adjust the value or chroma of a paint color without altering the color"s hue.