prov:value
| - In the preferred embodiment of this invention the reducing substance is a carbohydrate such as sucrose, starch or cellulose, a metal such as iron or aluminum powder or scrap aluminum foil, a chemical reductant such as stannous chloride or hydrazine, or black liquor or red liquor from wood pulp manufacture, molasses, bagasse, chaff, straw, wood, leaves, seaweed, and the like.
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