| 摘要 |
According to one embodiment, there is provided a developing agent including a toner particle containing a coloring agent, a binder resin and an ester wax having an alkyl group having a carbon number of from 32 to 46. When the wax is analyzed by an mass spectrometry, an ester compound having a carbon number showing the maximum strength ratio accounts for from 20 to 45% by mass of the whole of the wax.
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