ERASER

Eraser (also called eraser) is one of stationery supplies which are soft rubber that is able to eliminate the resulting mark with a pencil.

Removal rubbery, and often a white or black (though found also brown or pink to beautify the appearance of the appropriate use of technology). There are equipped with a pencil eraser on the end. Removal is expensive may have vinyl or plastic material in addition to the rubber.

Removal may also refer to the chalkboard eraser like a black board or white board. Traditional black board eraser is a rectangular block of wood made from fabric made from wool.

History

In 1770, Joseph Priestley science expert stated, "I have seen the most appropriate materials to be used to eliminate the charcoal pencil marks on paper." In the rest of Europe at the time, writing on paper with a pencil removed using small cubes made of rubber. Small cubes is still used for this purpose in the UK and Australia.

Also in 1770, Edward Naime, British engineer, known as the creator of the first rubber eraser. Prior to the use of rubber, bread powder is used as an eraser. Naime said that he was wrong to take the rubber pieces and powder instead of bread, and find characteristics remove from rubber, and began selling rubber erasers.

However, hard rubber in raw form is saved, kerana it easy and be damaged. In 1839, Charles Goodyear, an inventor, find prosesvulkanisasi, kaedah who care for the rubber and make it durable material. Eraser become common objects with the development of the vulcanized rubber.

In 1858, Hyman Lipman of Philadelphia, Pennsylvania, USA, received the first patent for sticking on the tip of a pencil eraser. Patent was later canceled because it was determined that it is simply a combination of two devices instead of completely new products.

type

The type often found in pencil usually colored pink or red with easy sticky characteristics. This type is good enough to remove most of the pencil writing, although he tends to contaminate and damage the paper if overused. In addition, a lot of the rest of the rubber to be cleaned. The remainder is often smeared if left attached.

Types are popular among artists is art gum eraser, which is made of a soft rubber coarse textured. This type is suitable for removing a wide area in one sweep without damaging the paper. But it left a lot of the rest of the eraser eraser and not very accurate. Use too much just produce a yellowish color on paper. Art gum eraser is usually dark or brownish.

Removal uli, better known in English as a kneaded eraser, also popular among artists. Removal of this type made of gray and resembles dough or glue. The surplus is not leaving the rest of the eraser that lasts longer than other eraser. Graphite and clay particles drawn by rubber dough so that a more accurate and does not leave any traces. This eraser is widely used to give effect luster or splashing. The disadvantage is a little taste of sticky to the touch and easy to melt at high temperatures.

Soft vinyl eraser has a texture like plastic and characteristics similar to remove gum eraser. It's just a little softer and stronger, and it is not easy to damage the paper and convenient to use. Penghapusvinyl usually white and easily look dirty if touched.

other uses

Although the main benefits of the eraser is to eliminate scratches, but by professional artists, eraser also be used with a particular technique. For example, give the impression of luster by using an eraser or a mall if scratched gently smudge effect.

Uli eraser can be used to provide effects such as water droplets to form it into granules and attach directly to the part that has been colored.

source: id.wikipedia.org