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An interesting situation, but water would definitely start violent expansion. What about something slightly more compressible - would some sort of an oil work as in veggie oil - or it is as non-compressible as water?

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I was fix´n to say Mercury or motoroil...but I guess it would restricted to animals which are not to be eating.

The best thing I could think of would be liquid margerine used for cooking?. Easy you work with and can be sealed with stiffer Wax.

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