| http://www.w3.org/ns/prov#value | - This drawback could be especially troublesome during attempts to employ mixtures of different compounds from the lot disclosed in the U.S. Pat. No. 5,935,755???e.g., in order to increase the number of available authenticating markings and codes. [0037] (e) Another potential drawback of the Raman-detectable compounds disclosed in the U.S. Pat. No. 5,935,755 is connected with the fact that these com
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