Manufacture of groundwood papers in the neutral range, permitting the use of calcium carbonate, has begun on this side of the Atlantic. It is not an American invention-Europeans have been doing it for a while. Facts, names, dates and places have not yet been released for publication, but this situation is bound to ease.
A kind of calcium carbonate that can tolerate acid conditions is being developed by Pfizer and is being tried out in several mills.
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