Polarity fixation of ink particles

A device comprising:

• a controller to cause a first fluid ejection device to deposit droplets of first color ink particles within a dielectric, non-aqueous first carrier fluid in a first pattern onto a substrate to partially form an image;
• a first charge source to emit, at a first location along a travel path of the substrate, first polarity charges to charge the first color ink particles to induce movement of the charged first color ink particles, via attraction relative to the substrate, through the first carrier fluid to become electrostatically fixed in the first pattern as the at least partially formed image relative to the substrate;
• and
• a second charge source to emit, at a second location downstream from the first charge source, opposite second polarity charges to charge the first color ink particles to maintain electrostatic fixation of the first ink particles, via the opposite, second polarity charges, relative to the substrate.

A method comprising:

• ejecting droplets of first color ink particles within a dielectric, non-aqueous first carrier fluid in a first pattern onto a substrate to partially form an image;
• directing, at a first location along a travel path of the substrate, first polarity charges to charge the first color ink particles to induce movement of the charged first color ink particles, via attraction relative to the substrate, through the first carrier fluid to become electrostatically fixed in the first pattern as the at least partially formed image relative to the substrate;
• and
• directing, at a second location downstream from the first location, opposite second polarity charges to charge the first color ink particles to maintain electrostatic fixation of the first ink particles, via the opposite, second polarity charges, relative to the substrate.