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These are sold at a wide range of prices. We bought two of these and tested their porosities. One absorbed 10% of its weight in water. That means a 30-gram saver would soak up only 3 grams of water. The other soaked up three times as much. The manufacturer of that one took advantage of the extra porosity by making a saver half the weight of the others. That one is not a terra cotta, they are iron staining a mix of commercial kaolin or ball clay and adding a filler.
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Better Porosity Clay for Brown Sugar Savers
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