The focus of this master’s thesis is the influence of starch on the physical degradation phenomena of cochineal oil paints on a tin substrate. These physical degradations include the formation of deep cracks, unusual sensitivity to aqueous solutions and mild organic solvents, a weathered surface, and crumbling of the paint. To research this, reconstructions of cochineal oil paints with and without starch were created and artificially aged. Subsequently, their degradation phenomena were examined.