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The dominant color of my scoby is, for lack of a better color vocabulary, light plum. But there are some whiteish bits which concern me a bit. I would say it smells fairly fresh (and sour) and tastes pretty good. Any thoughts?

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From what I hear in brewing, the main thing with infections is that they taste bad or smell bad, not that they are dangerous. So I generally hear that if it tastes bad, don't drink it, otherwise it's fine. Not sure how true this is, but for what it's worth that's what I've always done. –  pjreddie Mar 21 '13 at 3:50

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If the white bits are on the top, it is probably a mold. I once got this when I tried using honey as a sweetener instead of sugar. To get rid of the mold I first skimmed all of the white bits off the tea and then poured most of the brewed tea out except for a very very small amount. I then rinsed my scoby and added it to the small amount of brewed liquid and a new batch of tea and it was fine. Mothers are very adaptable and hard to annoy so often the problems are in the tea rather than the organism, but it is important to not let cultures grow. If this sounds like your issue, I would suggest doing the same.

What you need to be concerned about is the color of the scoby itself. If the daughter created looks discolored, that could be a problem. If the mother still looks fine you can throw out the daughter and make a new batch and see what happens. Otherwise if you have a reserve mother you keep in a jar in your fridge or cabinet, it might be a good time to start using it instead.

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