| 摘要 |
The composition contains a @ constituent which increases the concentration of hydrogen ions, and @ a benzoic acid a salt or derivative thereof such as p-hydroxybenzoic acid or its esters. The amount of the constituent @ may be 40-98% by weight and the amount of the benzoic acid constituent 2-60% by weight. Specified constituents @ are formic acid or a mineral acid, or formates with acid phosphates. |
