There is a ‘golden rule’ for ink manufacturers: The ink must be able to dissolve in the medium in which it is made. Most print heads can be submerged underwater as long as you dry up the contact points before inserting back in the printer. Sit the print head in a bowl of water for few hours. You can use water to dissolve or soften the blockage. Try this at Home: Dissolve the Blockage: Just Use Water There is a small rubber wiper to wipe out excessive ink. Some HP cartridges (950, 932) have built-in air bags, which will inflate and squeeze the ink out of the print head, to purge particles and to prevent drying. When you perform the head-cleaning routine, some printers have a suction chamber underneath the print head which will suck the ink out of the cartridge, thus unclogging the blockage. The particle size of filtered drinking water is about 1 µm. Many dye inks are filtered with 0.22 µm mesh which means the particles in the dye ink are twice the size of pigments. This picture shows the relative size of a print head jet opening and a pigment particle (small red dot). Pigment ink from reputable manufacturers has such a small size (0.1 µm) that it is almost impossible to block the opening of a print head jet. It is a common misconception that pigment ink is more prone to clogging than dye ink because pigment ink is in the form of suspended particles and somehow the particles aggregate and blocks the print head. There are processes that can permanently damage the nozzle the print head may be scratched and damaged, the print head may have over-heated during a long printing process, or a paper jam may have caused the issue. (*Note: This is why you should do a print head-cleaning cycle after installing a new cartridge).
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