Why do some printers have two black cartridges? -

Why do some printers have two balck cartridges. One thin and other a little fatter? If one runs out, the printer won t work without replacing it. Does not make any sense to me.

You have a canon. One is a pigment (the wider one) use for text. The other is a dye used for photos and graphics. A dye based ink cartridge mixes better with your dye based colour cartridge offering better tones in your final print. The pigmented black is a truer black which results in crisp and dark text printing.

one is blackink the other are color red blue green and yelllow i believe that are the colors that when combine make the right hues on your finished picture