{TAIL ~ The leuco phenazine dye} 1 wherein said electron withdrawing groups are {HEAD ~ fluorinated alkyl groups} having up to 10 carbon atoms 
{ TAIL ~ The leuco phenazine dye } 1 wherein said electron withdrawing groups are { HEAD ~ fluorinated alkyl groups } having up to 10 carbon atoms
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH