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The Hibiscus tea I use turns blue when I steep it at my mom's place, but not at mine. I have a very good water filter, she does not. First time it happened, I
by e40 4y ago
The Hibiscus tea I use turns blue when I steep it at my mom's place, but not at mine. I have a very good water filter, she does not. First time it happened, I was quite startled. She had a filter at her place she never used, so we tried it. Yep, filtered water resulted in pinkish tea.
What's in the water is unclear, but there was a lingering unease related to it.
- raverbashing 4y agoThe water in your mom's place is probably a bit acidic if I had to guess, and the filter removes the ions
- gweinberg 4y agoShouldn't it turn red if it's acidic and blue if it's basic?
- pflanze 4y agoYes. Also, it is my understanding that calcium in water (which is a normal part due to the water taking up minerals in the ground) is making it slightly basic. I don't know enough about chemistry in this area, but I think the calcium in the water is mostly calcium carbonate, which definitely is basic[1]. So it's no surprise that water taken directly from the tap is making the tea blue, but after removing the calcium carbonate (maybe as part of a removal of any salts) that the tea remains red. I think this hints that an ion exchanger[2] is being used in the "very good water filter" e40 is using. But removing calcium from water (along with other potentially beneficial minerals) is a bad idea, because we need it for building our bones etc. Hopefully those using ion exchanger are still getting enough calcium from other sources. But it's long been said that ion exchangers should not be used to "filter" water. [1] https://en.wikipedia.org/wiki/Calcium_carbonate https://en.wikipedia.org/wiki/Calcium_carbonate [2] https://en.wikipedia.org/wiki/Ion_exchanger https://en.wikipedia.org/wiki/Ion_exchanger PS. you can put some drops of lemon juice into your tea and it will shine red :) (and have a nicer taste)
- hoseja 4y agoThat might be iron actually, somehow. I once cut a banana with a carbon steel machette and it turned blue.
- ASalazarMX 4y agoIf you pardon my intrusion, may I inquire why were you using a machete to cut a banana?
- hoseja 4y agoIt's been a couple years (or more), I think I was just fucking around with a newly sharpened machette. Also I never managed to replicate it, though perhaps for lack of trying.
- quesera 4y agoI 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 agosilica 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.
- treeman79 4y agoThere are lots of people that love to mock those that prefer bottled water. https://xkcd.com/1599/ https://xkcd.com/1599/ I’ve lived in lots of areas were the water burned going down. One place were water was just brown. Filtered leaves it weirdly bland. But acceptable for coffee / tea.
- lightedman 4y agoHibiscus is a litmus indicator. Blue means your water is basic. That specific thing is how I make blue hibiscus pancakes.
- askvictor 4y agoMany flower petals can be made into a pH indicator.
- cma 4y agoWikihow: How to Make an Indicator for Acids and Bases Using Hibiscus Petals https://www.wikihow.com/Make-an-Indicator-Using-Hibiscus-Petals https://www.wikihow.com/Make-an-Indicator-Using-Hibiscus-Pet...
- rubatuga 4y agoYou can also use red cabbage water
- simonblack 4y agoLitmus itself comes from plants. (Lichens)
- foobar1962 4y agoThere could be something in the filter. A good test would be to make one tea with distilled water, and another with distilled+filtered water. Compare the colour.
- _Microft 4y agoSince nobody has linked to that yet: anthocyanins are sensitive to pH and can be found in a lot of things: https://en.wikipedia.org/wiki/Anthocyanin https://en.wikipedia.org/wiki/Anthocyanin
- adrinux 4y agoThis. Should have called a botanist not a microbiologist. That just looks like red cabbage was in there, shame there is no talk of other ingredients.