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Extend your ice.

Use 3 blocks

1) straight water. 1) water and 10% alcohol 1) water and 15% alcohol (Jim Beam works)

They thaw at different rates (so to speak) and at the melting point become 8000 X more efficient for a brief time. (1 BTU/lb frozen 80 BTU/lb melting) So, if they melt at different times, at three different times 1/3 of your ice becomes 8000 X more effective.

Article in GOB on this a few months back.
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