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Is there a test for solids other than the bucket of water and salt?
There is. Easiest is a hydrometer. http://www.zeal.co.uk/Hydrometers/Potato
The potato processors use this. It involves using a machine to pulverize the potatoes and weigh the solids then compare to the original weight. It's in their R&D departments.
Dr. Potato isn't a real doctor but a team of potato experts ready to answer all your potato questions.
Established in 1937, the Idaho Potato Commission (IPC) is a state agency that is responsible for promoting and protecting the famous "Grown in Idaho®" seal, a federally registered trademark that assures consumers they are purchasing genuine, top-quality Idaho® potatoes. Idaho's ideal growing conditions, including rich, volcanic soil, climate and irrigation differentiate Idaho® potatoes from potatoes grown in other states.
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