Holbein Watercolor 8ml Masking Fluid Ballpoint Pen
You can use the Holbein Ballpoint Masking Pen to highlight areas, draw fine lines, or make detailed expressions. The pen masking fluid is gray when wet and turns black once dry. Shake the pen well before use and gently squeeze the barrel to release masking fluid as you draw. Allow your masking fluid lines to dry before applying watercolor paint. To remove dried masking fluid, use a soft eraser or a rubber pick-up.
This product is safe and certified non-toxic by medical experts as containing no ingredients in sufficient quantities to be toxic or injurious to humans, including children.