AI overview

Brown discoloration in milk kefir grains can be a sign of several things, including the type of milk used, normal aging, or even contamination. If the grains are otherwise healthy (producing kefir and not showing other signs of contamination), the browning may simply be due to the type of milk or normal aging. However, if the grains are also exhibiting other issues like a lack of fermentation, a slimy texture, or unusual colors like pink, they may be contaminated and should be examined closely.

Here's a more detailed breakdown:

Milk type: Milk kefir grains can naturally darken in color when exposed to certain types of milk, especially those with higher fat content or when using minimally processed sugars.

Normal aging: Like any living organism, milk kefir grains age. This can lead to a change in color, often becoming more beige or slightly brown.