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I think the idea is leaving it open so it freezes from the top down. From what I've read there, the trick of clear ice is directional freezing. I've seen some
by tecleandor 3y ago
I think the idea is leaving it open so it freezes from the top down. From what I've read there, the trick of clear ice is directional freezing.
I've seen some other ideas like freezing water in a camping cooler with its top open.
- vladvasiliu 3y agoThat's what I thought the idea was, too. But then, why aren't my ice-cubes made in the regular fridge tray clear? The same principle should apply: they should be clear at the top, where the tray is open.
- wrs 3y agoThe thermos wall is an insulator, unlike the tray.
- hollasch 3y agoIce in a tray freezes from all sides since it's not insulated. And indeed, the ice from your tray is crystal clear on the sides, with the cloudy ice at the center of the cube. In an insulated vessel, the sides and bottom remain liquid until the frozen portion grows down from the top, pushing the cloudy bit to the bottom, which you can then just lop off.