Can I refill a black ink cartridge for a Brother 420 CN printer?

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Is there something in this printer that won’t let me cheap out and refill the ink instead of shelling out every time it runs out?
My ink cartridge kit doesn’t have this model number in it’s little instruction manual, but it does have the brand. Does that matter?
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I personally haven’t bought a new ink cartridge in many months, I refill them instead
Also here is a hint for refilling a color ink cartridge. Never follow the color code printed on the cartridge label. They do not correspond with the color in the well, so you will be mixing your colors.