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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.
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.
Inside the tin there are two set squares, a 180° protractor, a 15 cm ruler, a metal compass, a 9 cm pencil, a pencil sharpener, and an eraser. (In the 1970s a stencil for drawing chemical apparatus was included.) There is also a fact sheet and glossary of mathematical terms with a school timetable printed on the back.
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.
While the inventor of the commercial Bostik product is unknown, [3] a precursor was created around 1970 as an accidental by-product of an attempt to develop a sealant based on chalk powder, rubber and oil. Blu Tack was originally white, but following fears that children could mistake it for chewing gum, a blue colouring was added.
An erasing shield, eraser shield, or erasure shield [1] is a thin template or mask used to control the effects of an eraser, typically on paper media used by an artist, calligrapher, drafter, or typist. [2] [3] The tool is made of a thin, flexible material such as transparent plastic, or stainless steel shim stock for durability. [2]
Plastipedia is an online encyclopedia about plastics, starting from their birth in 1862 with the invention of Parkesine; it is hosted and maintained by the BPF.It has a comprehensive list of plastic manufacturing processes, and lists the 25 main processing technologies, including detailed animations.
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