The ionic behaviors of various kinds of developing agents in aqueous solution were surveyed by the method of paper electrophoresis. The apparent values of mobility were corrected by those of H
2O
2 under the same condition.
Hydroquinone and 1-phenyl-3-pyrazolidone showed always the negative mobility, whether the solution contains Na
2SO
3 or not, in the range of pH 3-13.
Developing agents having -NH
2 group showed in the solution not containing Na
2SO
3, the positive mobility in the range of pH less than 9, and the negative mobility in pH greater than 11. About 9-11 were the isoelectric points. In the solution containing Na
2SO
3, these points were located in the lower range of pH.
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