Editing Cobalt(II) chloride (section)

==Other uses==
* [[Invisible ink]]: when suspended in solution, cobalt(II) chloride can be made to appear invisible on a surface; when that same surface is subsequently exposed to significant heat (such as from a handheld [[heat gun]] or lighter) the ink reversibly changes to blue.<ref>{{cite web|url=https://edu.rsc.org/in-search-of-solutions/making-invisible-ink/1178.article|title=Making invisible ink|accessdate=7 April 2023 |publisher=[[Royal Society of Chemistry]]}}</ref>
* Cobalt chloride is an established chemical inducer of hypoxia-like responses such as [[erythropoiesis]].{{citation needed|date=November 2019}} Cobalt supplementation is not banned and therefore would not be detected by current anti-doping testing.<ref>{{cite journal |pmid=16244201 |doi=10.1136/bjsm.2005.019232 |volume=39 |issue=11 |title=Cobalt chloride administration in athletes: a new perspective in blood doping? |pmc=1725077 |date=November 2005 |journal=Br J Sports Med |pages=872–873 |vauthors=Lippi G, Franchini M, Guidi GC}}</ref> Cobalt chloride is a banned substance under the Australian Thoroughbred Racing Board.<ref>{{cite news |title=Cobalt crisis turns the eyes of the world onto Australian racing |url=https://www.smh.com.au/sport/racing/cobalt-crisis-turns-the-eyes-of-the-world-onto-australian-racing-20150206-137w22.html |first=Patrick|last=Bartley|newspaper=The Sydney Morning Herald |date=6 February 2015}}</ref>
* Cobalt chloride is one method used to induce pulmonary arterial hypertension in animals for research and evaluation of treatment efficacy.