I recently came across this great experiment that was shared on the Artist’s Network Wetcanvas forum. It was an experiment carried out and shared by artist Ben Sones: One of my medium yellowing tests–this one has been stored in the light (on the wall of my studio, where it receives daily north light) for about three years. These are swatches of straight medium on a piece of Arches Huile (sized) oil painting paper: The mediums are, starting on the top left: Gamblin Galkyd Lite Gamblin Galky
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Medium Yellowing Test by Ben Sones - Materials - Smartermarx