To the working strength developer add sodium thiosulphate crystals (Hypo).

加强显影加入硫代硫酸钠晶体（海波）。

To the working strength developer add sodium thiosulphate crystals ( Hypo ).

加强显影加入硫代硫酸钠晶体 ( 海波 ).

E. Titrate the solution with 0. 1N sodium thiosulphate until a straw colour is obtained.

用0.1N的硫代硫酸钠滴定溶液，直到获取淡黄色为止。