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CASNo parameter correction |
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{{Redirect|E131|the Japanese train type|E131 series}}
{{Chembox
| Name = Patent Blue V
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| CASNo = 3536-49-0
| CASNo_Ref = {{cascite|correct|CAS}}
| UNII_Ref = {{fdacite|correct|FDA}}
| UNII = 8QE473DV1Z
| CASNoOther =
| ChEBI = 59601
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The color of the dye is [[pH]]-dependent. In aqueous solution, its color will vary from a deep blue in [[alkaline]] or weakly [[acidic]] medium to a yellow–orange in stronger acidic
conditions. It is useful as a [[pH indicator]] for the range 0.8–3.0.<ref>{{cite book |title= Handbook of Acid–Base Indicators |url= https://archive.org/details/handbookacidbase00sabn |url-access= limited |first= R. W. |last= Sabnis |publisher= CRC Press |year= 2008 |pages= [https://archive.org/details/handbookacidbase00sabn/page/n311 295]–297 |chapter= Patent Blue V |isbn= 9780849382185 }}</ref> The structure is also [[redox]]-sensitive, changing from a reduced yellow form to an oxidized red form in solution. The [[reduction potential]] of around 0.77 [[volt]]s is similar to that of other triphenylmethane dyes. It is usable as a [[Reversible reaction|reversible]] redox indicator in some analytical methods.<ref>{{cite journal |title= Patent blue V as a pH and redox indicator |first1= John H. |last1= Yoe |first2= George R. |last2= Boyd |journal= Ind. Eng. Chem. Anal. Ed. |year= 1939 |volume= 11 |issue= 9 |pages= 492–493 |doi= 10.1021/ac50137a008 }}</ref>
Because of its pH-dependent color, Patent Blue V was included in chemistry sets from [[Salter Science]] in the 1970s and 80s under the name ''Sky Blue''.
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[[Category:E-number additives]]
[[Category:Diethylamino compounds]]
[[Category:Acid dyes]]
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