The image forming apparatus 17, wherein {HEAD ~ a fine powder} of {TAIL ~ Mohs scale} of hardness being not less than 6.0 is added to the developer from outside 
of
The image forming apparatus 17 , wherein { HEAD ~ a fine powder } of { TAIL ~ Mohs scale } of hardness being not less than 6.0 is added to the developer from outside
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH