You may have had the bad luck to get a bad unit. The mark I made on the dial for where "Straw" happens in the oven is a lower temperature than the notch for heating a TV dinner, or re-heating a plate of food. For blue/black, I didn't use the sand, but set it on the highest setting and let it run for half an hour or so. Pics below of straw and blue, thanks to Black and Decker's $35 t.o.
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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