What is this brown stuff in these milk cartons?

I have found several 1/2 gallon cartons of milk manufactured by Trader Joe’s have what looks like a brown slime at the bottom inside the milk cartons. Below, I show two example cartons of milk, one in each column. Each column includes a manufacturer date and product stamp (both are the same) photo. Each column also shows a closeup of the brown slime using a Teslong NTS500 Endoscope.

Carton #1

Carton #2

Author: Ron Fredericks

Ron Fredericks accelerates productivity within research labs: hands-on electronics, MATLAB, and python design; leadership in technical marketing. 2 biophysics patents, technical and leadership awards for IoT, and recognized technology educator.

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