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