Liquitex Professional Paint Marker with 8-15 mm Wide Nib - Iridescent Rich Silver Water-based acrylic and low odour paint, can clean up with soap and water when it is wet Lightfast and permanent with precision nibs It is highly pigmented and versatile Conforms to ASTM D4236, colour code: 239 Shake well before use to ensure paint is thoroughly mixed. Depress nib a few times to start paint flow. The valve remains open and releases paint the entire time the nib is depressed, so if held down for a long period, a large amount of paint is released. When you see paint appear on the nib pause for a moment. Wait until paint has stopped travelling down the nib before depressing the nib again. When the nib is adequately saturated, test, then apply. Re-pump as necessary but never directly on artwork to avoid paint splodges. It can take a while for paint to start flowing on initial activation. This will not be experienced on subsequent use.