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Keeps food cold without the health hazards and mess of melting ice.
-Stays colder longer than regular ice.
-Multiple layers of polyethylene are heat-sealed together for a strong, insulating bond.
-Silver reflective backing provides extra insulation.
-Food-safe, clear, non-staining purified water.
-Blue.
You can always remove it later.
Found on page 0801 of Source Book 2008 Fall/Winter