Schmincke Alcohol Retouch Varnish. 200ml. Intermediate varnish for oil painting. Colorless; does not yellow; very fast drying; can soften freshly dried oil colors; should not be used in layers with other mineral spirits based finishes (tends to dull!); not suitable as a final varnish; cannot be diluted with a turpentine substitute (50019); the dried varnish layer remains soluble in alcohol.