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The original was posted on /r/Ultralight by /u/quainte on 2024-08-08 14:52:57+00:00.
Hi guys, so I have a SOTO Thermostack which I use to make coffee. I’ve used the 400mL titanium cup to only boil water. And I start noticing that there are some spots appears at the bottom of the cup. Then stupidly I tried to heat the cup (empty), and it started to change to brownish color.
- Do you guys know what might be those tiny spots?
- Why does the cup change color to brown? Is it rust? Will it still be safe to use?
Thank you!
Sorry for my bad english
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