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