I'm looking into buying a set of refillable CLI-521 carts, with an auto reset chip (ARC), to fill with a good quality ink. Before I used compatible disposable ones, which is more expensive and the ink quality is often unknown.
I also refilled cartridges a lot, and used a chip resetter, which...
If you print photos (on photo paper) then you use the dye-based black (denoted K often times I gathered) instead of the pigment-based black (Bk). Now when does this "photo black" actually get used? Is it only for the parts of the photo where it is completely black ("true black")? Or does it also...