Indigo Carmine. Colorant and pH and Redox Indicator

Indigo carmine or indigotine is a blue colorant very used in food, pharmaceutical and textile industry. It is the pigment used to dye the denim or jeans fabric.
It is also a pH indicator that turns from blue to yellow at high pHs (alkaline). Below 11.4 is blue and above 13 its color is yellow.
It is also a redox indicator.
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