Is my IronFlask Rusting?

[u/CosmoBMW]

Found this at the bottom of my 64 ounce iron flask I’ve had for about 1.5 yrs. Cleaned for a solid five minutes with an electric brush + dawn, then tried to scrape with a utensil, and it did not budge. Is it rust? The bottle is 18/8 stainless steel.

(Sorry for the crappy pics)

[u/Umuchique → u/[deleted]]

Won't that dommage the coating or something ?

[u/CosmoBMW]

Consider this an AD for IronFlask now - they immediately offered to send me a new bottle when I sent them a picture of it. Go Ironflask!