Corrosion reactions, with metal dissolution, can occur in both basic and acidic solutions. 使金属溶解的腐蚀反应，可以在碱性也可以在酸性溶液中发生。
Formaldehyde in the air reacts with the phenol reagent triazine, triazine in the acidic solution of iron ions are oxidized to form a high blue green compound. 空气中的甲醛与酚试剂反应生成嗪，嗪在酸性溶液中被高铁离子氧化形成兰绿色化合物。
