| http://www.w3.org/ns/prov#value | - The set of claim 2 wherein the acid additive is an organic acid selected from the group consisting of polyacrylic, acetic, glycolic, malonic, malic, maleic, ascorbic, succinic, glutaric, fimaric, citric, tartaric, lactic, bromoacetic, chloroacetic, chloropropionic, phthalic, sulfonic, and ortho-phosphoric acid and derivatives thereof.
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