Brian ÓMy kid helped me make up a batch of agar plates using some PP5 food containers instead of regular petri dishes. Aside from being cheaper than petri dishes, they're autoclave-able, so you can pour and then sterilize instead of having to pour hot agar in a sterile environment. The lids also form a seal, so no need to use tape/parafilm to keep the dishes sealed. I'm in love already.
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