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Often "grayscale" is achieved by mixing some of your colors (CYM) to form composite black and gray - not necessarily just black from your black cartridge. Often there is some yellow used beneath the black -- so if you are getting a red or blue tint, it could mean something as simple as being low on yellow ink.
Try printing a test page, which shows a sample of the colors in the ink cartridge individually, usually yellow, cyan and red. It may be that the blue ink is getting low. You did not say whether you were printing text (black) or photos (color).
Inkjet printer inks are dye-based, and that's the reason.
Perhaps this will help explain things. You know those little boxes of food colouring you can buy in the supermarket - the ones that have four little bottles of colour - red, blue, yellow and green. Within reason you can combine these to turn white icing into most colours. Use nothing and the icing is still white or use everything and the icing will go a black-brown colour. Use a couple of drops of red and blue and you'll get purple.
But if you start with black icing, there's nothing you can add that will make it anything but black.
It's the same with your inkjet printer - because white is obtained by not having any ink print on the white paper. But of course that only works when the paper is white. Naturally you'll get different results on all colours of paper, decreasing as the paper gets darker in colour. Print blue on yellow paper and you should get green printing.
The only way to print in white is to do what commercial printers do - use opaque inks and include a white ink in the process. And as far as I know there's no commercial ink that will do that with an inkjet printer.
I can hear lots of you muttering "Rubbish. Of course you can print light colours on dark paper." Well all I can say is, have fun experimenting, but you won't be able to do it.
About the only way to achieve the sort of result you may be after is to print the job then trim it and paste it in place. For instance, if you want to print onto a black or dark-coloured T-shirt then print onto white transfer material, trim the print to size and iron it in place.
I'm assuming that the colour cartridge is a three in one. Blue, Yellow and Magenta.
When printing a colour document, the printer automatically balances colour mixtures from the three primary colours listed above. Should a print out be too red, its probably because its run out of yellow and/blue.
The best way to check is to print out a test page, you should get a block for each of the colours and black. If one's missing, there's your answer.
On a picture that you have printed, when you see an area of green, what color should it be? You probably have reduced flow of one of the "balancing" colors. Blue, Yellow and Red add up to Black. If your picture is supposed to be almost black and you don't have enough red, the color will pull toward the blue and yellow, giving it a green tint.