damn, I did go too hot by my first ss coil, by accident, idk the spaced coil somehow shorted and a small segment heated up rapidly, but it didnt change colour as described.
I did use the coil after that for a while....
I wouldn't be too worried about it.
I've been doing this for a Long Time, and have read Dozens and Dozens of Studies. And I have have never seen a Reputable Study that showed detectable amounts of Cr(VI) (or any other Chromium Oxides) in an e-liquid caused by a Dry Burned Coil.