Choicestationery, who supply excellent InkTek refill kits for Lexmark cartridges, suggest that you disregard the colours indicated on the label of the cartridge and refill it according to the colour position in their instruction leaflet.
This suggests to me that some manufacturers might deliberately mislead people who attempt to refill their cartridges.
The kits from Choicestationery include full instructions, all required tools, and are good value as far as I am concerned.
It could be worth your while to invest in one of their kits just to avoid spoiling your cartridge.
I have instructions for the X75 refill kit but it could be an entirely different cartridge to the Z35.