An amount of toner adhered to a toner image formed on the photosensitive drum using decolorizing toner when forming an image is controlled to 0.75 (mg/cm.sup.2) or below. As a result, a toner image formed on a paper is erased satisfactorily for the purpose of reusing the paper and the image density remaining on the paper is lowered.

 
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< Method for adjusting a fusing device of a digital printing machine by determining the humidity of printing material and measuring device to detect the reflectance of microwave signals at a print material

> Image forming apparatus

> Recording medium conveying unit and image forming apparatus having recording medium reversing unit
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