![Strange pink foam in boil kettle, brown/pink stain on metal | Homebrew Talk - Beer, Wine, Mead, & Cider Brewing Discussion Forum Strange pink foam in boil kettle, brown/pink stain on metal | Homebrew Talk - Beer, Wine, Mead, & Cider Brewing Discussion Forum](https://proxy.imagearchive.com/545/54560fb63849a784030d405aa71363fe.jpg)
Strange pink foam in boil kettle, brown/pink stain on metal | Homebrew Talk - Beer, Wine, Mead, & Cider Brewing Discussion Forum
When boiling water (for tea) sometimes a white foam forms on the top of the water? What causes this, and is the foam likely to be comprised of anything other than water?
![So I was cooking Integral rice, and this sort of dark grey foam began to form on the surface. Any ideas? : r/whatisthisthing So I was cooking Integral rice, and this sort of dark grey foam began to form on the surface. Any ideas? : r/whatisthisthing](https://preview.redd.it/g4gu8fbg8l351.jpg?auto=webp&s=0df8babe1160c8fbed8a71dba805747a516d48a1)