| http://www.w3.org/ns/prov#value | - The pH of the acid post treatment may be modified by employing at least one member selected from the group consisting of ammonium citrate dibasic (available commercially as Citrosol??? #503 and Multiprep???), fluoride salts such as ammonium bifluoride, fluoboric acid, fluorosilicic acid, among others.
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