Winsor & Newton - Conserv-Art Matt Varnish - 75 ml - Winsor and Newton Conserv-Art Removable Varnish is for use with oil, alkyd, or acrylic colors. It remains readily removable with turpentine or mineral spirits over a long period of time. Conserv-Art dries quickly to a non-yellowing film and does not bloom or crack. Gloss and matte finishes are available.