| http://www.w3.org/ns/prov#value | - Second, the conductive solution includes a source of current carriers besides the copper ions, which may include organic/inorganic acids and compounds such as sulfuric acid, phosphoric acid, acetic acid, butylacetic acid, propronic acid, butyric acid, ammonium sulfate, potassium hydroxide, tetra methyl, ammonium hydroxide, and the like.
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