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