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Universal indicator
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== History == Although there are several commercially available universal pH indicators, most are a variation of a formula patented by Yamada in 1933.<ref>''Jap. Pat.'' 99,664, Feb 21, 1933</ref><ref>''Chem Abstr'', '''28''', 2258 (1934)</ref><ref>{{Cite journal | doi = 10.1021/ed014p274| title = Demonstration experiments using universal indicators| journal = Journal of Chemical Education| volume = 14| issue = 6| pages = 274| year = 1937| last1 = Foster | first1 = L. S. | last2 = Gruntfest | first2 = I. J. | bibcode = 1937JChEd..14..274F}}</ref>
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