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Grumbacher Pre-Tested Professional Oil Colors
…Glides Smoothly! Grumbacher Professional Pre Tested Oil Paints- Everything Grumbacher makes is tested again and again at every stage of its existence, which inspired the name Pre-Tested®. Grumbacher's time-proven formulas are finely tuned through independent laboratory tests as well as hands-on…

Grumbacher Pre-Tested Professional Oil Color Sets
America's favorite oil paints since 1905! Proudly made in America using only the highest quality ingredients, Grumbacher Pre-Tested Oil Colors have been a favorite of artists for decades. Grumbacher's time-proven formulas are finely tuned through independent laboratory tests as well as hands-on…

Grumbacher Professional Oil Mediums
…arts oil paintings. Add to oil painting medium in drops as opposed to adding directly to oil paint. Cobalt Drier is a powerful additive for oil paints and should be used sparingly. Test medium before applying it to an oil painting. Overuse may cause cracking of paint film when drying. Copal Painting…
