Disclosed is a method to mitigate deterioration of printing fluid in a tank of a printer. The method comprises: draining printing fluid from a tank of a printer, and stopping the draining before the tank is empty, wherein the printing fluid comprises solids suspended in imaging oil, filtering the printing fluid drained from the tank, to separate at least some of the solids from the imaging oil, passing the filtered imaging oil to a reservoir; and then passing imaging oil from the reservoir to the tank. Also disclosed is a printer and a system to perform the method.

In an example of the disclosure, a priming lane and a non-priming lane are identified within an image frame to be printed by a printer. A line of molten wax is applied to the roller. The molten wax when cooled is to form a wax ridge upon the roller. The roller having the formed wax ridge is wetted with the primer. The wetted roller is rotated against the substrate to apply the primer. A first width of the wetted roller that does not include the wax ridge forms the priming lane upon the substrate. A second width of the roller that includes the wax ridge causes the primer to not transfer and thereby forms the non-priming lane upon the substrate.

A developing cartridge includes a casing, a developing roller, a supply roller, a first agitator and a second agitator. The casing is configured to accommodate toner therein. The supply roller is configured to supply the toner to the developing roller. The first agitator is configured to agitate the toner in the casing. The second agitator is configured to agitate the toner in the casing. The second agitator is positioned between the first agitator and the supply roller. The second agitator includes a blade having a tip end configured to contact a peripheral surface of the supply roller.

A solid particle aerosol development device form fogs of solid (e.g., frozen) fountain solution particles that are charged, and brings the charged solid fountain solution particles into proximity of an electrostatic charged image pattern on a imaging member's charge retentive surface. The charged solid fountain solution particles bond to the charge retentive surface at the charged image pattern to develop that image into a fountain solution latent image. The solid particle aerosol development devices produce solid fountain solution particles to develop electrostatic latent images while mitigating issues of evaporation and vapor production, and thus may apply fine films of fountain solution which may otherwise evaporate. In examples, the fountain solution aerosol development devices may include an anilox member, a metering member in contact with the anilox member, a fountain solution reservoir, a particle charger and a particle delivery baffle.

A solid particle aerosol development device form fogs of solid (e.g., frozen) fountain solution particles that are charged, and brings the charged solid fountain solution particles into proximity of an electrostatic charged image pattern on a imaging member's charge retentive surface. The charged solid fountain solution particles bond to the charge retentive surface at the charged image pattern to develop that image into a fountain solution latent image. The solid particle aerosol development devices produce solid fountain solution particles to develop electrostatic latent images while mitigating issues of evaporation and vapor production, and thus may apply fine films of fountain solution which may otherwise evaporate. In examples, the fountain solution aerosol development devices may include an anilox member, a metering member in contact with the anilox member, a fountain solution reservoir, a particle charger and a particle delivery baffle.

A print material container comprising a body to hold print material, a housing, and a detecting member. The housing being coupled to the body and including a movable mass to move in the housing when a shaking force is applied to the print material container. The detecting member to detect the shaking force and to signal a feedback of the shaking force relative to a shaking force threshold.

An image forming apparatus includes a first container configured to accommodate a liquid developer for replenishment to a developing container, a second container configured to accommodate a charge control agent for replenishment to the first container, a driving unit configured to be driven so as to replenish the charge control agent accommodated in the second container to the first container, and a control unit configured to control the driving unit based on image coverage of an output image so that a concentration of the charge control agent in the liquid developer accommodated in the first container becomes a predetermined value.

In one example of the disclosure, a first voltage is provided to an electrode of a development assembly during a first printing operation. The developer assembly includes a current-resistant coating and is to develop print fluid with conductive particles. Contemporaneous with the providing of the first voltage to the electrode, a second voltage is provided to a squeegee roller of the developer assembly. Data indicative of a measurement of optical density of a first image printed utilizing the developer assembly is received. During a second printing operation, if the measured optical density is outside a target optical density, contemporaneously the first voltage is provided to the electrode and a third voltage to the squeegee roller to adjust image optical density.

In one example of the disclosure, a developer system includes a housing and a developer roller. A first electrode and a second electrode are disposed in the housing, the first and second electrodes to create an electrical charge to cause transfer of printing fluid to a developer roller surface. The developer roller is rotatably connected to the housing. The developer includes a surface, a bearing to support and enable rotation of an axle attached to the developer roller, and a plurality of stop pins. The plurality of stop pins are connected to the housing. The stop pins are to support the bearings and to establish target distances between the developer roller surface and the first electrode and second electrodes.

In an example, a method includes collecting (102) print agent from a print agent reservoir to form a print agent layer on a first print agent transfer member (204). The print agent layer may be transferred (104) directly from the first print agent transfer member to a second print agent transfer member (206), where the print agent layer may be heated (106). The print agent layer may be applied (108) directly from the second print agent transfer member to a substrate.