Dye for denim

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it’s A 13 letters crossword puzzle definition.
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Possible Answers: INDIGO.

Last seen on: NY Times Crossword 18 Nov 20, Wednesday

Random information on the term “INDIGO”:

Sanjeev Dhurandhar is Professor at IUCAA, Pune. His research interest is detection and observation of Gravitational waves. Dhurandhar was part of the Indian team which contributed to the detection of gravitational waves. He is the science advisor to the IndIGO consortium council.

He was awarded one of the H K Firodia awards for 2016.

INDIGO on Wikipedia