| http://www.w3.org/ns/prov#value | - beforehand, and good images can be ensured till the last moment when the toner in the toner replenishing device becomes absent. [0023] As described above, according to the present invention, an image forming apparatus provided with at least one developing device having a developing container for containing therein a developer including a toner and a carrier, means for detecting the density of the
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