Is a color change in Serum/Protein-Free Cell Freezing Medium normal?

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Hello everyone, why did the color of Serum/Protein-Free Cell Freezing Medium (HY-K1012, MCE) change during use?

The product formulation includes pH indicators such as phenol red. Each time the bottle is opened or the liquid is handled, the pH may change, leading to color variations. It is recommended to aliquot and store the product if the usage amount is small.

The answer to this question comes from MedChemExpress Technical Support.

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