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Most brands of "OLFA" marker wipe off easily with acetone-free nail polish remover, the kind containing ethyl acetate, a relatively non-toxic organic solvent. A permanent marker can also be removed by drawing over it with a dry erase marker on non-porous surfaces such as a whiteboard , [ 3 ] as dry erase markers also contain a non-polar solvent.
Supervisors may use UV markers to inspect whether the staff has cleaned a toilet properly, and to rate how well the toilet has been cleaned. The marker used in this case is a lotion which is non-toxic and water-soluble, so it can easily be removed by soap and water solutions.
Gel pens. Compared to other inks, gel ink has higher melting point viscosity, which supports a higher proportion of pigments in the medium.The pigments are typically copper phthalocyanine, carbon black and iron oxides, and the gel is made up of water and biopolymers, such as xanthan gum and tragacanth gum, as well as some types of polyacrylate thickeners.
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.
Wet wipe markers were often used on overhead projector transparencies, as they could be stored and transported easily, unlike a traditional chalkboard. With the rise of computerized slide-shows (e.g. PowerPoint ) in the classroom and office, overhead usage has reduced substantially, and with it, the wet wipe marker.
Two grease pencils Historical diplomatic usage. The grease pencil, a wax writing tool also known as a wax pencil, china marker, or chinagraph pencil (especially in the United Kingdom), is a writing implement made of hardened colored wax and is useful for marking on hard, glossy non-porous surfaces.
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