Problem with wireless printer (officejet 6100)?

I have a wireless hp printer hooked up to a toshiba laptop. I recently ran out of ink, so I replaced the black, but left the color empty. I had previously set it to black ink only printing, but now it says it is unable to print. I have tried from the laptop and my iphone, but every time it comes up saying I'm out of ink. But I had used it before with only the black ink. What should I do?
It's a HP office jet 6100

With most printers, you are required and need to have ink in both the black and color ink cartridges in order to print in black as color ink is needed in this process. They work in conjunction with each other. So you will need to have the both usable color and black ink cartridges with ink and are not low, the same thing applies for color. Ink is a lubricant for the print heads. Some color ink is used even if you only print in black or vice versa. If you printed with a color missing, you could destroy that print head from the friction of running without ink to lubricate it

In the printer driver, there's an option for "gray scale" printing. That
should use only the black cartridge, but you also will need a usable color cartridge installed for that option as some color ink is also used.

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