| 摘要 |
The present invention relates to a developing agent comprising: toner particles containing at least a binder resin and a coloring agent; and metallic oxide fine particles represented by a composition formula SixAyO 4x+yz)/2 (wherein the character A represents a metallic element, the character Z represents a valence number of element A, and x/y is 1-25), the metallic oxide fine particles being hydrophobically treated if desired.
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