{HEAD ~ Useful catalytic inks} have low viscosity, e.g. about 20 600 centipoises , {TAIL ~ preferably 50 500 cp} 
have
{ HEAD ~ Useful catalytic inks } have low viscosity , e.g. about 20 600 centipoises , { TAIL ~ preferably 50 500 cp }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL