A method and system for purging bubbles from a fluid ejection head comprising a plurality of fluid flow channels including a first plurality of fluid flow channels flowing a first ink to a first actuator device and a second plurality of fluid flow channels for flowing a second ink to a second actuator device. During a bubble purging operation the first and second actuator devices are pulsed with different energies that depend on the viscosity of the first ink and the second ink. Heating the inks with different energies, results in the viscosity of the first ink to be same as the viscosity of the second ink. In one embodiment, a test pattern that includes a plurality of dots is printed to determine a clogged fluid ejection nozzle. Based on the determination, an actuator device corresponding to the clogged fluid ejection nozzle is pulsed.