| http://www.w3.org/ns/prov#value | - Also, instead of PDC, it is possible to use other halogenated derivatives of similar aromatic hydrocarbons, such as ortho-dichlorobenzene (in liquid form absorbed onto an inert carrier such as kieselguhr, pumice or other similar material), to obtain substantially the same effect as with the normally solid para-dichlorobenzene.
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