Winsor & Newton-Colorless Art Masking Fluid. A colorless, non- staining liquid composed of rubber latex for masking areas of work needing protection when color is applied in broad washes. Do not apply on damp or soft sized paper. Remove as soon as possible after application. Brushes can be cleaned if washed immediately with water after use. This package contains 75mL of masking fluid. Conforms to ASTM D4236. Imported