Hoefer SE400 - Manual (Page 41)

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14. Silver Nitrate solution
(0.1% w/v silver nitrate)
1 g silver nitrate
Distilled water 1 to L.
15. 3% Sodium Carbonate solution
(3% w/v)
60 g sodium carbonate
Bring to 2 L with distilled water, store in glass container.
16. Developing solution
(3% sodium carbonate, 0.019% formaldehyde)
200 ml of 3% sodium carbonate
100 µl of 37% formaldehyde
Prepare just before use.
17. Stop solution
(2.3 M sodium citrate)
67.64 sodium citrate, dihydrate (FW 294.1)
Bring to a final volume of 100 ml with deionized water.