| http://www.w3.org/ns/prov#value | - The treating solution also preferably includes a low to moderate concentration, such as about 0.1 to about 15.0 percent by weight, preferably 0.2 to 5.0 percent by weight of oxidizing agent, such as sodium or other alkali chromate or dichromate, or nitric acid (100 percent) at a concentration of about 0.05 to about 10.0 volume percent, preferably about 0.05 to about 2.0 percent by volume HNO3.
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