The original UK Masquepen consists of a polythene reservoir containing 30ml of our pale blue masking fluid. The applicator has an 0.8mm nylon nib, making masking out of fine areas for watercolour painting such as petals, masts, windows, rigging etc so much easier. Because of the built in applicator there are no more ruined brushes and it is as easy to use as a fountain pen with no waste. The masking fluid is pale blue in colour making it easy to see where it has been applied. Once dry it is easy to remove by gently rubbing.