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Erasers can come in various shapes and colors. Less expensive erasers are made from synthetic rubber and synthetic soy-based gum, but more expensive or specialized erasers are made from vinyl, plastic, or gum-like materials. At first, erasers were invented to erase mistakes made with a pencil; later, more abrasive ink erasers were
A kneaded eraser, also commonly known as a putty rubber, is a pliable erasing tool used by artists. It is usually made of a grey or white unvulcanized rubber (though it can be found in many different colors, such as green , blue , hot pink , yellow , and so forth) resembling putty or chewing gum.
Older ink erasers are therefore small knives designed to scrape off the top few microns of a sheet of paper, removing the ink that had penetrated. In concert with bladed ink erasers, an eraser similar to those at the end of pencils was also used, with additional abrasives, such as sand, mixed into the rubber.
Because non-etching ink doesn't penetrate the surface of the film the way it penetrates paper, it is often possible to remove inked lines from drafting film when drawing on it by hand; an abrasive-free vinyl drafting eraser is the preferred tool for this, [3] although a scalpel works too. [4]
After 5 years, Daniel Berozlzheimer's son Henry purchased the city's first iron-framed building for the new factory. The company produced pens, pencils, pen holders and erasers. In 1897, the London branch confirmed the policy of selling manufactured goods with high quality. Over the years, the company changed focus and goods.
In practice polyisoprene is commonly used to refer to synthetic cis-1,4-polyisoprene, made by the industrial polymerisation of isoprene. Natural forms of polyisoprene are also used in substantial quantities, the most important being " natural rubber " (mostly cis -1,4-polyisoprene), which is derived from the sap of trees.
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