Sentence:  Liter quantities of Mallinckrodt , <WSD>low</WSD> sulfur , reagent grade carbon tetrachloride were saturated with * * f and * * f and illuminated for about 50 hours with a 1000 watt tungsten lamp at a distance of a few inches . 
Meaning of the word marked with <WSD> tags:  less than normal in degree or intensity or amount