Frozen grape in supercooled water.
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Previously:
https://www.homemadetools.net/forum/...803#post152335
https://www.homemadetools.net/forum/...711#post174712
https://www.homemadetools.net/forum/...482#post200808
https://www.homemadetools.net/forum/...828#post226270
https://www.homemadetools.net/forum/...960#post220916
