Editing Chromium (section)

=== Uses of compounds ===
* [[Chromium(IV) oxide]] (CrO<sub>2</sub>) is a [[magnetism|magnetic]] compound. Its ideal shape [[anisotropy]], which imparts high [[coercivity]] and remnant magnetization, made it a compound superior to γ-Fe<sub>2</sub>O<sub>3</sub>. Chromium(IV) oxide is used to manufacture [[magnetic tape]] used in high-performance audio tape and standard [[compact audio cassette|audio cassettes]].<ref>{{Cite book|chapter-url = https://books.google.com/books?id=rNifWsBxnWkC&pg=PA32| title =The foundations of magnetic recording|first = John C.|last = Mallinson|publisher = Academic Press|date = 1993|isbn = 978-0-12-466626-9|chapter = Chromium Dioxide | page = 32}}</ref>
* [[Chromium(III) oxide]] (Cr<sub>2</sub>O<sub>3</sub>) is a metal polish known as green rouge.<ref name="DoiMarinescu2011">{{cite book|author1=Toshiro Doi|author2=Ioan D. Marinescu|author3=Syuhei Kurokawa|title=Advances in CMP Polishing Technologies|url=https://books.google.com/books?id=LJH9rYdKTZwC&pg=PA60|date=30 November 2011|publisher=William Andrew|isbn=978-1-4377-7860-1|pages=60–}}</ref><ref>{{cite journal|title = Chromium-based regulations and greening in metal finishing industries in the USA|volume = 5|issue = 2|year = 2002|pages = 121–133|doi = 10.1016/S1462-9011(02)00028-X|first1 = Anil|last1 = Baral|journal = Environmental Science & Policy|last2 = Engelken|first2 = Robert D.|bibcode = 2002ESPol...5..121B}}</ref> <!--{{doi|10.1016/0026-0576(95)99364-G}} {{doi|10.1016/S0026-0576(02)82003-7}} https://books.google.de/books?id=LJH9rYdKTZwC&pg=PA60 -->
* [[Chromic acid]] is a powerful oxidizing agent and is a useful compound for cleaning laboratory glassware of any trace of organic compounds.<ref>{{cite web |last1=Soderberg |first1=Tim |title=Oxidizing Agents |url=https://chem.libretexts.org/Bookshelves/Organic_Chemistry/Map%3A_Organic_Chemistry_(Smith)/Chapter_12%3A_Oxidation_and_Reduction/12.07_Oxidizing_Agents |website=LibreTexts |publisher=MindTouch |access-date=8 September 2019 |date=3 June 2019 |archive-date=22 April 2021 |archive-url=https://web.archive.org/web/20210422223905/https://chem.libretexts.org/Bookshelves/Organic_Chemistry/Map:_Organic_Chemistry_(Smith)/Chapter_12:_Oxidation_and_Reduction/12.07_Oxidizing_Agents |url-status=live }}</ref> It is prepared by dissolving [[potassium dichromate]] in concentrated sulfuric acid, which is then used to wash the apparatus. [[Sodium dichromate]] is sometimes used because of its higher solubility (50&nbsp;g/L versus 200&nbsp;g/L respectively). The use of dichromate cleaning solutions is now phased out due to the high toxicity and environmental concerns. Modern cleaning solutions are highly effective and chromium free.<ref name="Roth1994">{{cite book|last1 = Roth|first1 = Alexander|title = Vacuum Sealing Techniques|url = https://books.google.com/books?id=sdKAPJh5RgQC&pg=PA118|year = 1994|publisher = Springer Science & Business Media|isbn = 978-1-56396-259-2|pages=118–}}</ref>
* [[Potassium dichromate]] is a chemical [[reagent]], used as a titrating agent.<ref>{{cite web |last1=Lancashire |first1=Robert J |title=Determination of iron using potassium dichromate: Redox indicators |url=http://wwwchem.uwimona.edu.jm/lab_manuals/c10expt31.html |publisher=The Department of Chemistry UWI, Jamaica |access-date=8 September 2019 |date=27 October 2008 |archive-date=18 April 2021 |archive-url=https://web.archive.org/web/20210418125750/http://wwwchem.uwimona.edu.jm/lab_manuals/c10expt31.html |url-status=live }}</ref>
* [[Chromate and dichromate|Chromate]]s are added to drilling muds to prevent corrosion of steel under wet conditions.<ref>{{cite book|title = Corrosion in the Petrochemical Industry|first = Linda|last = Garverick|publisher = ASM International|date = 1994|isbn = 978-0-87170-505-1|url = https://books.google.com/books?id=qTfNZZRO758C&pg=PA278|access-date = 5 June 2020|archive-date = 10 June 2024|archive-url = https://web.archive.org/web/20240610045936/https://books.google.com/books?id=qTfNZZRO758C&pg=PA278#v=onepage&q&f=false|url-status = live}}</ref>
* [[Chrome alum]] is [[Chromium(III) potassium sulfate]] and is used as a [[mordant]] (i.e., a fixing agent) for dyes in fabric and in [[tanning (leather)|tanning]].<ref name="Ul-Islam2017">{{cite book|author=Shahid Ul-Islam|title=Plant-Based Natural Products: Derivatives and Applications|url=https://books.google.com/books?id=jYMtDwAAQBAJ&pg=PA74|date=18 July 2017|publisher=Wiley|isbn=978-1-119-42388-1|pages=74–|access-date=17 October 2018|archive-date=10 June 2024|archive-url=https://web.archive.org/web/20240610050514/https://books.google.com/books?id=jYMtDwAAQBAJ&pg=PA74#v=onepage&q&f=false|url-status=live}}</ref>