Vitrail colors allow creating beautiful stained glass effects The colors dry to a hard, uniform surface and finished pieces are resistant to gentle washing with water or window cleaner. Vitrail colors can be applied with a brush on glass, polyester, acetate, canvas and metal The colors can be combined with the Vitrail no-drip medium for application on vertical surfaces. Objects decorated with Vitrail colors are intended for decorative purposes only and should not be considered for practical usage.