Wikipedia>Kombucha is a fermented black tea. Some people drink it for the purported health benefits, but I'm rather sceptical of them; I brew and drink it because it's fun, healthier than soda, and tastes much better :D
Terminology
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SCOBY: Symbiotic Culture Of Bacteria and Yeast (Wikipedia>SCOBY)
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Microbial mat (or pellicle): a gelatinous, cellulose-based clump of SCOBY found floating at the liquid-air interface at the top of the brewing container (Wikipedia>Microbial mat)
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People often refer to the SCOBY pellicle as just “the SCOBY”, but this is misleading; the SCOBY is actually present throughout the liquid. It's just primarily visible in the form of the biofilm/pellicle/microbial mat that grows where the air and liquid kombucha meet.
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See ./01 growing the pellicle/pellicle in hand and ./01 growing the pellicle/pellicle on plate for pictures
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