| http://www.w3.org/ns/prov#value | - When the polishing composition of the present invention comprises an abrasive, hydrogen peroxide, an acidic reducing agent such as oxalic acid, piperazine and water, due to a neutralization reaction of the reducing agent with piperazine, the content of oxalic acid which practically acts as a reducing agent, will be a content obtained by subtracting the content of piperazine from the oxalic acid (h
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