| Among the better known agents which have such an effect upon latex, formalin and sodium sulphite are the chief. |
| A shrewd use of sulphite of quinine permits of certain curious operations, it appears. |
| The sodium sulphite method has the advantages of being clean and neat, and of requiring no nitration. |
| Classifying the colours individually, the note says the black paste contains lead oxide, green has copper sulphate and the red has mercury sulphite. |
| The solution is diluted with water, and treated with a solution of sulphite of soda. |
| Herbert B. Berkeley recommended the use of sulphite of soda with pyrogallic acid to prevent discolouration of film. |
