Editing Copper(II) oxide (section)

==Uses==
As a significant product of copper mining, copper(II) oxide is the starting point for the production of many other copper salts. For example, many [[wood preservative]]s are produced from copper oxide.<ref name=Ullmann/>

Cupric oxide is used as a [[pigment]] in ceramics to produce blue, red, and green, and sometimes gray, pink, or black glazes.<ref name=Ullmann/>

It is incorrectly used as a dietary supplement in [[animal feed]].<ref>{{cite web|title = Uses of Copper Compounds: Other Copper Compounds|publisher = Copper Development Association|year = 2007|url = http://www.copper.org/applications/compounds/other_compounds.html|access-date = 2007-01-27|archive-date = 2013-08-15|archive-url = https://web.archive.org/web/20130815084358/http://www.copper.org/applications/compounds/other_compounds.html|url-status = dead}}</ref> Due to low bioactivity, negligible copper is absorbed.<ref name= "Baker">{{cite journal|doi=10.1093/jn/129.12.2278 |title=Cupric Oxide Should Not be Used as a Copper Supplement for Either Animals or Humans |date=1999 |last1=Baker |first1=David H. |journal=The Journal of Nutrition |volume=129 |issue=12 |pages=2278–2279 |pmid=10573563 }}</ref>

It is used when welding with [[copper alloys]].<ref>{{cite web|title = Cupric Oxide Data Sheet|publisher = Hummel Croton Inc.|date = 2006-04-21|url = http://www.axxousa.com/data/cuox_d.html|access-date = 2007-02-01|archive-date = 2011-07-07|archive-url = https://web.archive.org/web/20110707202129/http://www.axxousa.com/data/cuox_d.html|url-status = dead}}</ref>

A copper oxide electrode formed part of the early battery type known as the [[Edison–Lalande cell]]. Copper oxide was also used in a [[lithium battery]] type ([[IEC 60086]] code "G").

===Pyrotechnics and fireworks===
Used as moderate blue coloring agent in blue flame compositions with additional chlorine donors and oxidizers such as chlorates and perchlorates. Providing oxygen it can be used as flash powder oxidizer with metal fuels such as magnesium, aluminium, or magnalium powder. Sometimes it is used in strobe effects and thermite compositions as crackling stars effect.