Impasto Putty is an oil painting medium of finely ground calcite, barite and bentonite in bodied linseed oil. Use it to extend paint without altering the consistency, making oil colors 'short' and buttery for impastos. Stiffer than Impasto Medium and Vel?zquez Medium, this putty makes colors slightly transparent while allowing you to build impasted, thick applications of paint. When added to oil paint, Impasto Putty does not alter its color temperature. It can be thinned with solvent or oil. Depending upon the proportion added to paint, Impasto Putty does not affect the drying time significantly.Impasto Putty does not contain stearates, solvents, driers or natural or synthetic resins, so it is safe to add to oil paint without the worry of cracking or delaminating.Impasto Putty is a calcite and barite-rich oil-painting medium. The stiff white paste has little affect on oil colors, making them less opaque and slightly less saturated. Use it to build thick applications of color.Impasto Putty slightly increases the transparency of colors while maintaining the buttery consistency. It allows you to build impasto or thick paint with ease. When added to oil paint, brushstrokes hold their form without slumping or leveling.