Why did my kombucha SCOBY develop black spots or strange colors?

Question

Why does your SCOBY have black spots or strange colors? Learn to tell the difference between harmless yeast stains and dangerous mold growth.

Answer 1

Black spots or strange colors on your kombucha SCOBY are often a sign of harmless yeast activity or changes in the SCOBY's composition, but can sometimes indicate mold. Distinguishing between the two is crucial for safe brewing.

Detailed Explanation:

The appearance of black spots or unusual colors on a kombucha SCOBY can be alarming, but it doesn't always mean your brew is ruined. Here's a breakdown of what might be happening:

1. Yeast Activity: Kombucha SCOBYs contain various types of yeast. Sometimes, these yeasts can produce dark or colored pigments, leading to spots or streaks on the SCOBY. This is generally harmless and doesn't affect the kombucha's safety or flavor.

2. SCOBY Composition Changes: As the SCOBY ages, it can develop darker patches or a brownish hue. This is due to the accumulation of dead yeast cells and changes in the SCOBY's structure. Again, this is usually normal.

3. Mold Contamination: Mold is the most concerning reason for discoloration. Mold on a SCOBY typically appears fuzzy, dry, and can be blue, green, black, or white. If you see fuzzy mold, it's best to discard the entire batch (SCOBY and liquid) to avoid potential health risks.

4. Mineral Deposits: Sometimes, mineral deposits from your water or tea can accumulate on the SCOBY, causing discoloration. These deposits are usually harmless but can be removed gently.

To determine if the discoloration is mold, carefully examine the affected area. Mold will have a fuzzy, raised texture, while yeast activity or SCOBY changes will usually be smooth and integrated into the SCOBY's surface. If you're unsure, it's always better to err on the side of caution and discard the batch.

Pro Tip:

Take a clear photo of your SCOBY before each batch. This will help you track changes and more easily identify potential mold issues early on. If you are unsure, compare the current state of your SCOBY to the previous photos.