Specifically, the substances should be water-miscible or water-soluble, but not water itself. Additionally, they should be absorptive but not opaque.

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    $\begingroup$ Water itself is such substance. $\endgroup$ – Ivan Neretin Jun 9 '16 at 20:08
  • $\begingroup$ Ah right. I'm interested in substances other than water. I've edited my question. $\endgroup$ – MackTuesday Jun 9 '16 at 21:08

Sure - ethanol and methanol (among others) are listed here as being "high absorbers" of microwave energy.

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