| http://www.w3.org/ns/prov#value | - Unlike many presently available compositions which are toxic and therefore must be washed off the treated area within minutes of application, the present compositions can be left on the treated area for periods up to several hours if desired, e.g. for 5 minutes, 10 minutes, 15 minutes, 5-15 minutes, 30 minutes, 1 hour, 2 hours, 3 hours, 4 hours, 6 hours, 8 hours, 10 hours, 12 hours, or even 24 hou
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