@fenngen I guess so - that's not the instructions I was given, and they sseem to know what they are talking about. Soaking in boiling water sounds like a good idea anyway. I'll let you know what happens next and waht the next experiment is if you are interested?
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Highly interested π
Okay, so I found out in this week's lesson that the cardboard just doesn't have enough nutrients in it for mould to grow in, unless it's super wet.... the oyster mushrooms are happy to eat the cardboard, but it's not going to have mould issues like, say, coffee grounds. So if you have spilt egg on your egg carton you might get mould because of the extra nutrients in there.