The algae retardant roofing granules 1 wherein {HEAD ~ said microvoids} in said second or outer layer have {TAIL ~ an average thickness} of from about 0.05 micron to about 0.5 micron 
have
The algae retardant roofing granules 1 wherein { HEAD ~ said microvoids } in said second or outer layer have { TAIL ~ an average thickness } of from about 0.05 micron to about 0.5 micron
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH