Why does antifreeze have that fluorescent green glow - as if it were some alien chemical in a science fiction film?

Is the glow caused by something added to antifreeze or is it inherent? All antifreezes seem to glow although the shades are different.

  • I think it used to come that way so the coolant would be recognized as such. You'll find today antifreeze comes in about a dozen different colors. Green is just one of them. Sep 10, 2018 at 0:03

1 Answer 1


"Disodium fluorescein dyes are added to antifreeze to help trace the source of leaks, and as an identifier since some different colored formulations are incompatible"


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