That's why they use agar instead of gellatin. The structure it forms doesn't get eaten. At least around here, getting agar flakes is pretty easy. I'd be glad to mail you some if you can't find them locally.
And finding disposable petri dishes was really easy. It was finding a place selling autoclavable ones for less than $5/each that was a bit tricky. I'm still going to keep my eye on ebay for a nice batch of pyrex ones.
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And finding disposable petri dishes was really easy. It was finding a place selling autoclavable ones for less than $5/each that was a bit tricky. I'm still going to keep my eye on ebay for a nice batch of pyrex ones.