| http://www.w3.org/ns/prov#value | - Thereafter, while the mixture is still in the homogenizer, an alkaline earth metal salt is added at 6, e.g. calcium or magnesium carbonate, possibly together with a small fraction of the chloride of the same alkaline earth, and preferably in such a manner as to ensure that the quantity of calcium carbonate lies in the range 5% to 10% of the dry content, for example, while the quantity of calcium c
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