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All wood-encased pencil leads (I don't know about mechanical pencil lead composition; it may differ) are comprised of three major ingredients - Graphite, Clay, and a small amount of wax.
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everything2.com/title/Pencil+lead
everything2.com/title/Pencil+lead
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Lead is made of a composition of substance and binder. The substance of a ... pencil lead can be graphite, carbon, charcoal, lithographic grease, colored ... writing on a slick surface. The selection of a pencil lead is a matter of...
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www.tpub.com/content/draftsman/14064/css/14064_128.htm
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A pencil lead comprising a binder, a filler and a colorant as essential components, said filler consisting at least partially of a fibrous material of magnesium oxysulfate. This pencil lead has a ... MOS employed as a fibrous filler in this invention is a hydrated inorganic substance represented by the chemical formula:
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www.freepatentsonline.com/4668572.html
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Complete Patent Searching Database and Patent Data Analytics Services. ... US Patent References:; /RE07907.html; - - RE07907; /0376456.html; - - 0376456; Self-hardening graphite lead for pencils; - - 1937105; Pencil and crayon rod; - - 2220992; Water-soluble cellulose ether composition; ... CHEMICAL SEARCH...
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www.freepatentsonline.com/2566754.html
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An example that the properties of an object are based on its chemical composition is the ability of graphite (in pencil lead) to be easily transferred to paper, where it remains in a clearly defined shape. This property comes directly from the crystalline structure of carbon atoms in sheets.
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www.scienceteacherprogram.org/chemistry/Fisher99.html
www.scienceteacherprogram.org/chemistry/Fisher99.html
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316 t1 material composition municipal waste composition studies phonetic composition hip hop composition of the planet jupitier jupiter composition silk chemical composition chemical composition of cells composition of peanut oil composition art molded composition roof ;
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aboutalmeria.com/rwzpi/composition.php
aboutalmeria.com/rwzpi/composition.php
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Lead has been the traditional composition of bullets since the 15th century. In spring 1999, the US Army began issuing soldiers with environmentally friendly bullets containing tungsten ... lead III; lead III; lead III; lead III; Lead Impression Tool; lead in; lead in; Lead in drinking water; lead in pencil; Lead India;
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encyclopedia.farlex.com/lead+in+pencil
encyclopedia.farlex.com/lead+in+pencil
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In order to familiarize conservators with this deceptive medium, this article describes the composition and uses of copying pencils, ... One 1877 patent for a copying pencil describes its usefulness as an "ordinary lead pencil...but more permanent, ... [6] Arthur Rose and Elizabeth Rose, eds. The Condensed Chemical Dictionary,
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www.pencilpages.com/articles/bp17-05.html
www.pencilpages.com/articles/bp17-05.html
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The dark gray color dominates the dried brittle pencil-lead, so you never notice any whitish color or lighter gray. The main effect of the stone powder is: when packed together, it is harder than pure graphite carbon.
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www.newton.dep.anl.gov/askasci/chem03/chem03556.htm
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