Since the second reagent 17 is directed toward the first reagent, {HEAD ~ the amount} of liquid reagent necessary to wet {TAIL ~ the first reagent} 13 is reduced and the remainder of the test pad 12 may remain substantially dry 
Since the second reagent 17 is directed toward the first reagent , { HEAD ~ the amount } of liquid reagent necessary to wet { TAIL ~ the first reagent } 13 is reduced and the remainder of the test pad 12 may remain substantially dry
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH