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[[File:Salt and ice challenge hand day 11.jpg|thumb|Scarring as a result of the salt and ice challenge, eleven days after performing it]]
The '''salt and ice challenge''' is an Internet challenge in which participants pour [[salt]] on their bodies, usually on the arm, and ice is then placed on the salt.<ref>{{cite news |last1=Vang |first1=Gia |date=29 July 2012|url= http://fox4kc.com/2012/07/29/experts-dont-try-salt-and-ice-challenge/ |title= Experts: Don't Try 'Salt and Ice Challenge' |website=[[FOX4KC]] |access-date=28 June 2013 |archive-date=31 July 2012 |archive-url= https://web.archive.org/web/20120731061055/http://fox4kc.com/2012/07/29/experts-dont-try-salt-and-ice-challenge/ |url-status=live}}</ref> This causes a "burning" sensation similar to [[frostbite]], and participants
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The stunt can quickly cause second- and third-degree injuries similar to frostbite or being burnt with the metal end of a [[lighter]], as well as causing painful [[Ulcer (dermatology)|open sores]] to form on the skin. Due to the numbing sensation of the cold and possible nerve damage during the stunt, participants are often unaware of the extent of any injuries sustained during the challenge, only feeling pain once the salt on their skin enters lesions created during the challenge. Skin discoloration from the challenge may remain after the challenge has been attempted.<ref>{{cite web |last1=Jaslow |first1=Ryan |date=2 July 2012 |url=https://www.cbsnews.com/news/ice-and-salt-challenge-leaves-12-year-old-pittsburgh-boy-with-second-degree-burns/ |title="Ice and salt challenge" leaves 12-year-old Pittsburgh boy with second-degree burns |website=[[CBS News]] |access-date=24 June 2013|archive-date=3 July 2012 |archive-url=https://web.archive.org/web/20120703104247/http://www.cbsnews.com/8301-504763_162-57465323-10391704/ice-and-salt-challenge-leaves-12-year-old-pittsburgh-boy-with-second-degree-burns/ |url-status=live}}</ref><ref>{{cite web |last1=Kwak |first1=Janet |url=http://www.nbclosangeles.com/news/health/ice-and-salt-youtube-challenge-skittles-cinnamon-dare-burns-doctors-161177865.html |title=Ice-and-Salt Challenge Fires Up Health Officials |date=3 July 2012 |website=[[NBC Los Angeles]] |access-date=24 June 2013|archive-date=9 November 2013 |archive-url=https://web.archive.org/web/20131109064322/http://www.nbclosangeles.com/news/health/ice-and-salt-youtube-challenge-skittles-cinnamon-dare-burns-doctors-161177865.html |url-status=live}}</ref><ref>{{cite web |last1=Templeton |first1=David
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== Scientific explanation ==
The salt and ice form an eutectic frigorific mixture. [[Chemical polarity|Molecular polarity]] is key to this reaction. The ions in [[sodium chloride]] (table salt) are heavily influenced by the molecular polarizability of the ice.<ref>{{Cite journal |last1=Kim |first1=Jun Soo |last2=Yethiraj |first2=Arun |year=2008 |title=The effect of salt on the melting of ice: A molecular dynamics simulation study |journal=The Journal of Chemical Physics |doi=10.1063/1.2979247 |volume=129 |issue=12|pmid=19045033 |bibcode=2008JChPh.129l4504K }}</ref> The difference between the spacing of the electrons in the table salt and ice causes this reaction. The [[melting point]] of ice is decreased due to the incorporation of table salt and this then causes a binding of the two substances. The ice is neutralized by the salt, thus causing the ice to melt more easily and quickly.<ref>{{cite journal |last1=Breakey |first1=William |last2=Crowley |first2=Timothy P. |last3=Alrawi |first3=Mogdad |year=2015 |title=Salt and Ice, a Challenge Not to Be Taken Lightly
== Health hazards and injury recovery ==
The stunt leaves behind an [[Frostbite|ice burn]] that increases in severity the longer the chemical reaction on the skin continues. In this ice burn, the [[ice crystal]]s that form have the potential to burn and scar the skin permanently. [[Blister|Blistering]] at the site of injury is common in more severe cases.<ref>{{cite journal |last1=Sachs |first1=Christoph |last2=Lehnhardt |first2=Marcus |last3=Daigeler |first3=Adrian |last4=Goertz |first4=Ole |year=2015 |title=The Triaging and Treatment of Cold-Induced Injuries |journal=Deutsches Ärzteblatt International |volume=112 |issue=44 |pages=741–747 |doi=10.3238/arztebl.2015.0741 |pmid=26575137|pmc=4650908 }}</ref> The freezing of tissue between the [[Dermis|dermal]] and [[Epidermis|epidermal]] levels of the skin leads to a disruption in blood circulation, initially causing frost nip.<ref>{{Cite journal |last1=Long III |first1=William B. |last2=Edlich |first2=Richard |last3=Winters |first3=Kathryne L. |last4=Britt |first4=L. D. |year=2005 |title=Cold Injuries |url=https://www.dl.begellhouse.com/journals/1bef42082d7a0fdf,2ed3f1eb04c82575,08a591dc670a33fb.html |journal=Journal of Long-Term Effects of Medical Implants |language=English |volume=15 |issue=1 |pages=
== In popular culture ==
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