Kombucha SCOBYs and Mold: A Visual Comparison
We get quite a few photos sent to us from brewers across the globe, inquiring about kombucha SCOBYs - "Is this mold?" It's usually pretty simple to tell mold from healthy, or just bizarre, brews. Bizarre brews can result from extreme temperature fluctuation, the use of highly unrefined sugars, oily or flavored teas, or too much or too little of any ingredient; however, they won't usually create dry, fuzzy formations on the surface of the brew. Mold will always be dry and fuzzy, and form on top of the liquid in your brew jar. Read this blog post for more thoughts on kombucha and mold.
The photos below indicate healthy brews in various stages of growth - some may be 3 days of growth, indicated usually by thin, papery culture growing on the surface, to thick cultures with lots of yeast involved. You'll see strands of yeast growing below the surface of the tea, like tendrils, reaching down into the brew - this is completely normal. The opaque, greenish/brownish blobs are yeast too. Often, yeast will collect on one side of your brew jar, just under the SCOBY.
As always, please keep sending photographs of your home brews! We're always happy to receive and assess the brews for you. Happy brewing!