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Here are two demonstration videos where Spot Test Strips are put to use on a sample of ground beef and raw potato.  The individual samples are masked and one half is treated with a 5% sodium sulfite solution.  The samples are allowed to sit for approximately one week in a refrigerator for the ground beef and approximately 2 hours for the raw potato.  The samples are wetted using tap water and test strips applied.  All you need is some water to allow the test strips to work.  For sample that are wet all you need is the test strip.  

 

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