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Pencil Mark Erasers
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Posted On :
Feb-19-2010
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Article Word Count :
382
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Lead was used to write on paper, as lead is a soft material and leaves dark marks. Basically lead is toxic and not safe to use, the other alternative used for writing is a material called Graphite. This material leaves darker marks than lead.
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Lead was used to write on paper, as lead is a soft material and leaves dark marks. Basically lead is toxic and not safe to use, the other alternative used for writing is a material called Graphite. This material leaves darker marks than lead. I would make a lot of mistakes as a child in school while writing with pencil; the most essential of our tools from pencil box was the Eraser (we called it rubber). We learnt in school how rubber was made.
The Natural rubber came from a sap of the tree called Para rubber tree. The natural latex is extracted from the tree trunk and then processed to form a rubber. As in history the Para rubber tree grew in South America and it is said that a first European to return to Portugal from Brazil with samples of water-repellent rubberized cloth shocked the people that it was taken as a witchcraft and taken to court. First time when the samples of rubber arrived in England, Joseph Priestley in the year 1770 was who first time discovered that the piece of the rubber was extremely good for erasing pencil marks on the paper and hence the name was given as rubber.
Before rubber erasers were discovered tablets of wax were used to erase lead/charcoal marks from paper. It is also found that to erase pencil mark the use of rolled up piece of bread was used (crust was cut off). Some artist still use to lighten charcoal or pastel marks. Erasers have a rubbery consistency as they are made from rubber and are often in white or pink color, though the modern materials allow Erasers to be made in many colors.
The normal Erasers are made of synthetic rubber, but there are specialized Erasers which are more expensive which also contain vinyl, plastic, or gum-like material. The different types of Erasers that you will find in the market are 1. Art gum: this eraser type is very popular among the artists. 2. Kneaded Erasers: the specialty of this eraser is that it does not wear away or leave behind eraser residue. 3. Electric erasers 4. Soft vinyl erasers which have a plastic like texture and erase more cleanly than the standard pink erasers.
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Article Source :
http://www.articleseen.com/Article_Pencil Mark Erasers_11344.aspx
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Author Resource :
For more insights and further information about erasers visit our site http://www.hapaculture.com
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Keywords :
erasers,
Category :
Business
:
Small Business
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