A paint marker is a type of marker pen that is used to create permanent writing on a variety of surfaces from paper to metal to stone and glass.
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Unlike with most permanent markers the ink is an oil-based paint and generally requires shaking before use, similar to an aerosol spray paint can. In addition, the line is very opaque and, unlike spirit-based or other permanent inks, will not fade with exposure to UV light, and overlays all other colors beneath it. The paint from these types of markers is not truly permanent, as it can be removed using high pressure cleaning or paint thinning solvents such as acetone.
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Paint markers, and permanent markers generally, contain the toxic compounds xylene or toluene. Like spray paint, these markers give off volatile organic compounds, which can be dangerous when not used in a well ventilated area or with a particulate mask. Gloves can also be worn to avoid absorption through the skin.
Solidified paint pens
Another type of paint marker is the solidified paint pen. This is a type of marker, often contained within a twist tube, that is a cylinder of semi-hardened oil-paint with a pointed tip. As one writes with it, the point wears down and must be advanced to in order to continue writing. The marker leaves a mark similar to that of chalk. It is useful for marking on wet or oily surfaces. It is sold under the brand name MeanStreak in the United States and generic versions are also available online. It is made by Sanford, the maker of Sharpies, but there are many different brands and types of solidified paint pens.
Source of the article : Wikipedia