Spontaneous milk thickening is usually “curdling” which is a result of the PH changing due to bacterial growth and the proteins clumping together. Choosing palatable bacteria to do this is how cottage cheese (and other cheeses) are made. If your milk is just thickening the way you’re describing then it’s possible that you’re spontaneously creating yogurt but I have to wonder if you’re actually working with amygdalate (almond “milk”) or other milk substitutes, which coalesce more commonly due to different chemical actions.
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