Second question -I usually use following simple composition: put in one liter of hot, not boiled, water two soap spoons of copper vitriol and one soap spoon of fixing agent, mixed and than filter.

• 第二个问题，我通常用以下简单的组成：在一升热水（而不是开水）中两皂粉勺硫酸铜和一皂粉勺的固色剂（定影液），混合并过滤。