Sentence:  After drying the sections under the fan , fixing in <WSD>acetone</WSD> , and drying at 37 ` as in the indirect method , the sections were treated with conjugated * * f or * * f ( undiluted unless mentioned otherwise ) for 5 - 30 minutes . 
Meaning of the word marked with <WSD> tags:  the simplest ketone; a highly inflammable liquid widely used as an organic solvent and as material for making plastics