However, the color developing sensitivity generally declines when {HEAD ~ a color developing agent} with {TAIL ~ a high melting point} is used 
with
However , the color developing sensitivity generally declines when { HEAD ~ a color developing agent } with { TAIL ~ a high melting point } is used
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH