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This insect was trapped alive for 30,000,000 Years
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dart board;; science bs
rule #1: be kind
The premise is wrong, though. Resin tends to be acidic. You know what doesn't like acid treatment? Chitin, on account of being a polysaccharide.
And even - or especially - if the resin was perfectly neutral, it would slowly suck the fats stored in the insect's tissues out of the same.
Plus the O~2~ that's slowly diffusing in - and out - of the resin will, especially in connection with sunlight, decompose more and more stuff.
Whatever the decomposition processes are, you can see an orange-tinted sort of halo around the mantis. That's the mixing zone - mantis molecules, meet resin molecules.