I am feeling very pleased with myself as I have finally found a way of sealing my petri dishes. The very small ones are fine as they have a tight fitting lid which just needed a spot of super glue but the larger ones have a lid which is a fair bit bigger than the base. Tried clear tape - puckered and looked awful - so did a bit of research and an order of special tape arrived today. I'm really chuffed at how well it's worked. - very nearly invisible. Just need to check it stays put over time....
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