from about 75% to {HEAD ~ about 90%} by {TAIL ~ weight} of a mixture of at least two abrasive powders comprising at least 50% by weight of calcium carbonate 
by
from about 75 % to { HEAD ~ about 90 % } by { TAIL ~ weight } of a mixture of at least two abrasive powders comprising at least 50 % by weight of calcium carbonate
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH