The Boise River Painted in Casein

Boise River VIII

Boise River IX

A note about casein from Jack Richeson & Co.: Casein (kay'seen) is a quick-drying, aqueous medium using a milk-based binding agent, and is one of the most durable mediums known to man. Nine thousand year old casein cave paintings have been discovered in Asia, and later, the medium was used by Byzantine, Roman and Renaissance artists including the Old Masters. Known for their versatility and array of capabilities, casein paints can be used to create a variety of effects from the rich opaques of oil to thin watercolor washes.
http://www.richesonart.com/products/paints/richesoncasein/richcaseinstory.html