Editing Marker pen (section)

==Parts==
The marker reservoir, which holds the ink, is formed from [[polyester]]. The "[[felt]]" used for the tip is usually made of highly compressed synthetic fibers or porous ceramics. [[Toluol]] and [[xylol]] were used as [[solvent]]s for the dye and are still used for the indelible ink in permanent markers. Due to their toxicity, they have often been replaced with less critical substances such as [[alkyl]] or cyclic alkylene carbonates (like [[propylene carbonate]]) in other types of markers. Water content of the ink can be up to 10%. Besides solvents and the dye itself, the ink may contain additives (e.g. nonylphenylpolyglycol ether, alkylpoly-[[glycol ether]], fatty acid polyglycol ester, or fatty alcohol ethoxalates) and preservatives (e.g. [[2-Phenylphenol]] and its sodium salt, 6-acetoxy-2,4-dimethyl-m-[[dioxane]]).<ref>{{cite web |url=http://www.madehow.com/Volume-3/Marker.html |title=How marker is made - material, manufacture, making, history, used, product, machine, History, Raw Materials |publisher=Madehow.com |date=1997-07-14 |access-date=2017-02-15 |url-status=dead |archive-url=https://web.archive.org/web/20170202053046/http://www.madehow.com/Volume-3/Marker.html |archive-date=2017-02-02 }}</ref><ref>{{cite journal |author=David A. Black |title=Fiber Tipped Pens |volume=57 |journal=J. Crim. L. Criminology & Police Sci. |year=1966 |issue=4 |pages=521–525 |doi=10.2307/1140564 |jstor=1140564 |url=http://scholarlycommons.law.northwestern.edu/cgi/viewcontent.cgi?article=5419&context=jclc |url-status=live |archive-url=https://web.archive.org/web/20171107151936/http://scholarlycommons.law.northwestern.edu/cgi/viewcontent.cgi?article=5419&context=jclc |archive-date=2017-11-07 |url-access=subscription }}</ref><ref>{{cite web |url=http://www.historyofpencils.com/writing-instruments-history/history-of-marker-pens/ |title=History of Marker Pens |url-status=dead |archive-url=https://web.archive.org/web/20161213162138/http://www.historyofpencils.com/writing-instruments-history/history-of-marker-pens/ |archive-date=2016-12-13 |access-date=2017-01-31 }}</ref>