HP 510 - Manual (Page 159)

Printing images in grayscale
There are times when you may want to print a color image in grayscale because it is faster. Examples of this are:
•
You want a draft where color is not important, for example to check that the image is not going to be clipped.
• You want a version for photocopying in black and white.
When you choose the Ink menu Color settings > Grayscale option, the printer renders colors as gray scales. If you
want to use only black ink to print in grayscale, you should select the Ink menu Color settings > True black option.