I use HP 23 & 45 cartridges. I sawed one of each open and the filler which I presume is cotton or rayon was only stained from the original filling for the bottom 10 %.
Refilling both types was about 50% successful. When it was successful it worked OK from the git go. When it wasn't, it would start leaving blank lines through the picture or printing. I think it has something to do with the multitude of copper foil strips on the cartridge making contact with the printer pins.
Like Elspode the second filling was always a failure.
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