. . . "Alkali metal hydroxides, such as lithium hydroxide, sodium hydroxide and potassium hydroxide, alkali metal carbonates, such as sodium carbonate, potassium carbonate and potassium bicarbonate, alkali metal sulphides, such as sodium sulphide, potassium sulphide and potassium bisulphide, alkali metal thiosulphates, such as sodium thiosulphate, alkylamines and furthermore ammonium hydroxide and ammoni" . .