Schmincke Ammonia Free Masking Fluid - Coloured 100ml

Ammonia-free masking fluid in a fine-tip dosing pen, tinted blue so it's easy to see exactly where you've masked. Apply directly to watercolour paper, cardboard, or similar grounds to protect highlights and fine details from washes.

Dries to a rubbery, water-insoluble film in minutes to about an hour depending on thickness, then rub away gently with a clean, dry finger or eraser once your painting is dry.

Remove within two days to avoid yellowing, and skip very soft or heavily textured papers, which the fluid can tear.