Marker pen, or marker, is a term used to refer to various kinds of
pens which have their own
ink-source and usually a tip made of a porous material, including felt or nylon. When the tip is made of
felt it can be called a felt-tipped pen. However, see dialectal variations, below. A temporary marker uses an erasable ink - an ink that adheres to the writing surface without binding or being absorbed. Such
non-permanent markers are intended for use on overhead projectors,
whiteboards, or for use by children when adults want to be able to clean up after them. Special "
security" markers with
fluorescent but otherwise invisible inks are used for marking valuables in case of
burglary. The owner of a stolen, but recovered item can be determined by using
ultraviolet light to make the writing visible.
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