When the reaction is complete, {TAIL ~ the solvent layer} containing {HEAD ~ the leuco dye} is isolated and treated with a decolorizing agent, e.g., Attapulgus clay 
When the reaction is complete , { TAIL ~ the solvent layer } containing { HEAD ~ the leuco dye } is isolated and treated with a decolorizing agent , e.g. , Attapulgus clay
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH