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by Martyn F. Chillmaid/science Photo Library
$5.00
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Our greeting cards are 5" x 7" in size and are produced on digital offset printers using 100 lb. paper stock. Each card is coated with a UV protectant on the outside surface which produces a semi-gloss finish. The inside of each card has a matte white finish and can be customized with your own message up to 500 characters in length. Each card comes with a white envelope for mailing or gift giving.
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Chemical hand warmer. The pad contains a supersaturated sodium acetate solution. Super saturation occurs when a chemical is present in a solution in... more
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2 - 3 business days
Chemical hand warmer. The pad contains a supersaturated sodium acetate solution. Super saturation occurs when a chemical is present in a solution in high concentrations, normally sufficient to crystallise out of solution. However, this chemical can remain supersaturated at room temperature until it is activated by pressing the small metal disk (lower left). This prompts nucleation and crystallisation, releasing heat. Unlike other types of heating pad, this one can be heated and reused, as the process is reversible.
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$5.00
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