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rennet not working... [cheesemaking]

tango25 Jun 25, 2013 08:12 AM

My auntie sent me a small bottle of animal rennet she bought online. I tried making some mozzarella cheese but the milk didn't set at all. This is the first time this has happened and I'm just wondering what the problem was...

The package my auntie sent me arrived in less than a day. (She used same day shipping). But do you think there's a chance the rennet was destroyed (lost potency) during shipping due to hot weather?