A reader wrote: A new method for detecting egg white and pig gelatin in aged red wine has been developed and is described in the journal Food Chemistry (online first 7 December 2020, 128822): https://www.sciencedirect.com/science/article/abs/pii/S0308814620326844?via%3Dihub
Readers may also be interested in https://www.vrg.org/blog/2020/12/21/vegan-wine-its-time/
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