Assertion: hydrogen sulfide's concentration | /r/CapableOf | increase above 68%
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Source sentences:
text: Commercial grades from 70% to 98% are also available, but due to the potential of solutions of more than 68% hydrogen peroxide to be converted entirely to steam and oxygen (with the temperature of the steam increasing as the concentration increases above 68%) these grades are potentially far more hazardous and require special care in dedicated storage areas.