| 摘要 |
The deoxidising agent contains, as the active component, an aromatic organic acid having at least one sulpho group (SO3H) or a derivative thereof. Examples of these are benzenesulphonic acid, m-benzenedisulphonic acid, benzene-1,3,5-trisulphonic acid, water-soluble metal salts of these acids or hydrates of these acids and metal salts thereof.
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