—, keeping, [111]
—, neutralising by lime and sulphur, [129]
—, — by sodium hyposulphite, [127], [129]
—, — by sodium sulphate, [128]
—, — by sodium thiosulphate, [127], [129]
—, preparing, [110]
—, proportion of antichlor required to neutralise, [128]
—, quantities needed, [112]
Blitz’s sulphide process, [67]
Blondel’s acid process for wood, [69]