Editing Guar (section)

====Industry====
Derivatives of guar gum that have been further reacted are used in industrial applications, such as the paper and textile industries, ore flotation, the manufacture of explosives and [[hydraulic fracturing]] (fracking) of oil and gas formations.<ref name=NYT71612/><ref name=NYTimes>{{cite news |title=In Tiny Bean, India's Dirt-Poor Farmers Strike Gas-Drilling Gold (Published 2012) |website=[[The New York Times]] |date=17 July 2012 |archive-url=https://web.archive.org/web/20190107072503/https://www.nytimes.com/2012/07/17/world/asia/fracking-in-us-lifts-guar-farmers-in-india.html?smid=go-share |archive-date=2019-01-07 |url-status=live |url=https://www.nytimes.com/2012/07/17/world/asia/fracking-in-us-lifts-guar-farmers-in-india.html?smid=go-share}}</ref> Guar gum is often crosslinked with boron or chromium ions to make it more stable and heat-resistant. The crosslinking of guar with metal ions results in a gel that does not block the formation and helps efficiently in formation cleaning process. Guar and its derivatives make gel complexes with ions of aluminium, zirconium, titanium, chromium and boron.<ref name="Guar derivatives in Fracturing Fluids">{{cite web |url=http://www.chemtotal.com/guar-gum-derivatives-as-fracturing-fluids.html |title=Guar gum derivatives |publisher=Chemtotal |access-date=3 March 2013 |archive-url=https://web.archive.org/web/20130225174108/http://www.chemtotal.com/guar-gum-derivatives-as-fracturing-fluids.html |archive-date=25 February 2013 |url-status=dead }}</ref>  The borate&ndash;guar reaction is reversible, and depends on the pH (hydrogen ion concentration) of the solution. This reaction is used to give the toy [[Slime (toy)|"slime"]] its consistency. Crosslinking of guar with borate occurs at high pH (approximately 9&ndash;10) of the solution. Guar gum has proven as useful substitute for [[locust bean gum]] (made from [[carob]] seeds).