Professional Photo Printers

[SallyFacer]

Even though I've only been printing in black and white all other colour cartridges are running out.... how come????

[ebiggs1]

The printer uses all inks to make black. 

You can use grayscale but it still uses some of the color inks.

[ebiggs1]

Some printers have a control setting where you can specify to only use the black cartridge but I don't think Canon has it.

I might be wrong on this so someone else may know better but I believe it to be true.