Artists' Picture Cleaner by Winsor & Newton is a natural resin/oil designed for dissolving linseed oil oxidation and cleaning varnished paintings. This liquid will remove dirt from the surface and the products of oxidation in the old varnish. Winsor & Newton recommends that a picture that needs to have old varnish removed should be entrusted to a competent picture restorer. Great care is necessary when using Artists' Picture Cleaner.