Solar Cooking
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Water is transparent. Sunlight, or much of it, just passes through it. Wax is opaque. Sunlight that strikes it is mostly absorbed, warming the wax. So if a wax-based indicator is surrounded by water and placed in full sunlight, it is possible that the wax may get warmer than the water. So the indicator may show that a safe pasteurization temperature has been reached, when in fact the water is cooler.
 
Water is transparent. Sunlight, or much of it, just passes through it. Wax is opaque. Sunlight that strikes it is mostly absorbed, warming the wax. So if a wax-based indicator is surrounded by water and placed in full sunlight, it is possible that the wax may get warmer than the water. So the indicator may show that a safe pasteurization temperature has been reached, when in fact the water is cooler.
   
[[User:DOwenWilliams|DOwenWilliams]] 15:24, June 14, 2012 (UTC)
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[[Special:Contributions/70.54.37.171|70.54.37.171]] 15:22, June 14, 2012 (UTC)
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