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This became possible through the use of random copolymers of polyethylene glycol, which adsorbs water well, and polypropylene glycol, which adsorbs water slightly less well.

The oligoethylene glycol units act as a type of shock absorber that adjusts to the appropriate length to make certain the shapes can fit together in a near-perfect manner.

The glycol chills the trays in order to keep the ice near 22 degrees.

The leaching performance of citric acid and ethylene glycol has been explored before, but that approach used more acid and a lower temperature, which proved less effective, Bai said.

The Public Prosecutor said that between October 2021 and February 2022 the company received two batches of propylene glycol, which is used for making cough syrup.