This is a older article from GIA so I will leave the link for it first. A drop of water can do it.
https://www.gia.edu/gems-gemology/fa13-ln-technique-hydrophane-opal#
Testing for hydrophane without drowning the stone
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SwordfishMining
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Testing for hydrophane without drowning the stone
I'll jump over my shadow. https://www.virginvalleyopal.com"
Opals & more at my ESTY store https://swordfishmining.etsy.com"
Opals & more at my ESTY store https://swordfishmining.etsy.com"