The actual etch rate of the first bath was 0.15 mils/min before and 0.65 mils/min after {HEAD ~ the addition} of {TAIL ~ additive}  
of
The actual etch rate of the first bath was 0.15 mils / min before and 0.65 mils / min after { HEAD ~ the addition } of { TAIL ~ additive }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH