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I remember a grade school science experiment where something about moisture or humidity caused a color change from blue to pink (or vice versa?). I think the i

I remember a grade school science experiment where something about moisture or humidity caused a color change from blue to pink (or vice versa?). I think the important bit was cobalt chloride. Doesn't sound like an ingredient in hibiscus tea though!

jgamman 4y ago
silica dessicant. chemists use it in their dessicators to keep things dry - pink is dry, blue is 'full' (i think, it's been 25 years...). i think it's a low level cobalt doping and as the silica matrix swells with water absorption it changes the UV absorption and the colour changes. or something like that.