An image forming apparatus includes an image forming unit and developing containers. The image forming unit includes developing stations to form an image on a print medium with toners, based on input image data. The developing containers contain the toners and are attachable to and detachable from the developing stations. The developing containers include a first developing container containing a first toner and a second developing container containing a second toner having a higher luminescence intensity under invisible light than the first toner. The first toner and the second toner are toners that form an image having a higher luminescence intensity under the invisible light than under visible light. The image forming unit adheres the second toner to the print medium before adhering the first toner when the image forming unit superimposes the first toner and the second toner one atop another on the print medium.

An image forming apparatus which comprises a first image forming unit for forming a toner image for printing by means of a toner for printing and an adhesive image forming unit for forming an image of a powder adhesive by means of a powder adhesive, and which is characterized in that: the toner for printing contains a wax; the powder adhesive contains a wax; and the content of the wax in the powder adhesive is higher than the content of the wax in the toner for printing.

An image forming apparatus includes an image forming unit and developing containers. The image forming unit includes developing stations to form an image on a print medium with toners, based on input image data. The developing containers contain the toners and are attachable to and detachable from the developing stations. The developing containers include a first developing container containing a first toner and a second developing container containing a second toner having a higher luminescence intensity under invisible light than the first toner. The first toner and the second toner are toners that form an image having a higher luminescence intensity under the invisible light than under visible light. The image forming unit adheres the second toner to the print medium before adhering the first toner when the image forming unit superimposes the first toner and the second toner one atop another on the print medium.

An image forming apparatus includes plural image holding bodies and plural developing devices that respectively develop images on the image holding bodies by using developers that are different from each other in fluidity, in which each of the developing devices includes an accommodation portion that accommodates a developer and that includes a first transport path extending in one direction, a second transport path disposed below the first transport path and extending in the one direction, a first connection portion connecting one end of the first transport path and one end of the second transport path to each other, and a second connection portion connecting the other end of the first transport path and the other end of the second transport path to each other, a first transport member that is disposed in the first transport path and that transports the developer from one end to the other end in the one direction, a second transport member that is disposed in the second transport path and that transports the developer from the other end to the one end in the one direction, a discharge path that extends in the one direction from the one end of the first transport path and through which the developer flowing out from the first transport path is discharged to an outside of the accommodation portion, and a discharge transport member that is disposed in the discharge path and that transports the developer flowing out from the first transport path, and the lower a fluidity of the developer to be accommodated in the accommodation portion is, the more the discharge path, the discharge transport member, the first transport path of the accommodation portion, or the first connection portion is shaped to facilitate discharge of the developer to the outside of the accommodation portion.

An electrostatic charge image developer set includes a developer (1) and a developer (2) each containing a toner and a carrier, in which a carrier (1) of the developer (1) includes magnetic particles, a resin coating layer that covers the magnetic particles, and inorganic particles contained in the resin coating layer, a carrier (2) of the developer (2) includes magnetic particles and a resin coating layer that covers the magnetic particles, and a value of A(1)/A(2) is 17 or more and 105 or less, where when an element ratio of a metal and a semimetal that constitute the inorganic particles of the carrier (1) is analyzed by X-ray photoelectron spectroscopy for each of the carrier (1) and the carrier (2), an element ratio on a surface of the carrier (1) is denoted as A(1) and an element ratio on a surface of the carrier (2) is denoted as A(2).