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The old style cartridges had a yellow tab that you used to peel from the top.
This allowed air into the cartridge, so during printing the ink could come out of the nozzles. If this wasn't done then after a few prints a vacuum would form inside the cartridge and no ink could escape.
We have replaced this yellow tab on some cartridges with a yellow spike tool that you use to pierce certain holes on the label side of the cartridge. This reduces the chance of any air channels from not being exposed.
This technique is used for black cartridges T007, T017, T026, T028, T036, T040, T066 and for colour cartridges T008, T009, T018, T027, T029, T037, T041, T067
A more detailed instruction sheet from
Remember to pierce all the air holes on the cartridge
Black has only 1 air hole Colours have either 3 or 5 air holes depending on the model
You do not need to pierce the ink nozzle(where the ink comes out) as the printer will do this on installation.