I’ve got a sick SCOBY on my hands. Things had been going well with the Kombucha brewing (see part I and part II of the experiment). I generally start off each batch and then forget about it until I get a reminder on my phone telling me that it should be nearly ready. Unfortunately, when I checked on the last batch, I found a sick SCOBY.
This is definitely not mould but the SCOBY has a grey colour along the edges that doesn’t look good. There has always been brown stringy substances floating in the container and attached to the SCOBY. These are not a problem – it is just a by-product of the yeast culture. This greyness is different though and seems to be changing the colour of the SCOBY itself. The Kombucha from this batch is very cloudy and doesn’t taste good so I’m throwing it out.
From reading, it seems that the grey colour could be a sign that the SCOBY is worn out but apparently SCOBY exhaustion doesn’t happen very often and wearing out a SCOBY should take a long time. I suspect emotional contagion might be at play!
Another (more realistic) possibility is that something contaminated my brew. I notice that the covering cloth is now discoloured so I think that maybe the SCOBY tried to climb out of the jar (yes it happens when there is too much CO2). If this was the case then the SCOBY would have been touching the cloth for some time and this might have caused the problem.
In any case, this is all part of the fun of home-brewing. There was a second SCOBY that had detached from the others and was sitting at the bottom of the jar. It doesn’t have any signs of greyness so I’ve added it to a new jar of tea. I didn’t think it was safe to use the Kombucha from the grey batch but had some left over from a previous batch so I used it instead. Now I just have to wait. Fingers crossed for no more exhausted SCOBYs.
If you are running into any Kombucha problems, I recommend these websites for troubleshooting: