A marker is a pen wich has its own ink-sourse and usually a tip made of a porous, pressed fibres such as felt. A typical permanent marker consists of a container (glass, aluminum or plastic)and a core of an absorbent material such as felt. This filling serves as a carrier for the water-proof ink. The upper part of the marker contains the nib that was made in earlier time of a hardfelt material, and a cap to prevent the marker from drying out. Today, the ink is usually made on the basis of alcohols (e.g. 1-propanol, 1-butanol, diacetone alcohol and cresols).
Acorrection fluid is an opaque, white fluid applied to paper to mask errors in text. Once dried, it can be written over. It is typically packaged in small bottles, and the lid has an attached brush (or atriangular piece of foam) which dips into the bottle. The brush is used to apply the fluid onto the paper.One of the first forms of correction fluid was invented in 1951 by the secretary BetteNesmith Graham, founder of Liquid Paper.
A highlighter is a felt-tip pen used to draw attention to sections of documents by marking them with a vivid, translucent colour. A typical highlighteris fluorescent yellow, coloured with pyranine.was introduced in 1963 by Carter's Ink Company, using the trademarked name Hi-Liter.
Ring binders (sometimes called files in Britain) are foldersin which punched pieces of paper may be held by means of clamps running through the holes in the paper. There are also zipper binders, which zip the binder up and keep papers from falling out.Some binders are stored in matching slipcases for greater protection; either with one slipcase per each binder, or one slipcase holding several binders.It is also possible to insert the sheet ofpaper into a polypropylene sheet protector. The sheet protector already has the holes, so the document can be kept untouched and unwrinkled.
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