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