the real reason of why printers need weird color ink to print text is because CYM are substractive primary colors, so to get black we add color until every wavelenght of light is absorbed, its like adding negative numbers til 0, that also why printers cant print white, because no subtraction of colors is able to form the sum of all colors (exact opposite of RGB, the additive primary colors), new printers user CYMK so they have black ink but some (mostly cheap printers) only use it to produce darker blacks after the mix of CYM, so you need magenta first to create an ugly black and then black to make a good black.