dipping {HEAD ~ fabric samples} in {TAIL ~ the 10% acid solution} using a glass tray to contain the acid, 
dipping { HEAD ~ fabric samples } in { TAIL ~ the 10 % acid solution } using a glass tray to contain the acid ,
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH