Ink runs out quickly PIXMA iP 1000

Why is color ink used when printing in black and white?



Even when printing in black and white, color ink is used for
the following reasons:
1. Automatic cleaning of the print head.
To prevent the print head nozzles from clogging, the print head is automatically cleaned periodically. At that time, a small amount of each color ink is consumed.
Therefore, although printing in black and white is performed, color ink is also consumed.

2. Color inks may be used to create black.
When printing in grayscale or on special paper, although printing appears in black and white, the color black may be created using the three (cyan, magenta, and yellow) color inks.
Therefore, although printing in black and white is performed, color ink may be consumed.

article source : www.canon.com