Are these 240XL and 241XL ink cartridges 100% compatible with my printer? Will it damage the printer?
With the latest upgraded chip version, ejet ink cartridges can achieve 100% compatibility and perfectly avoid printer damage.
How many pages will these ink print?
630 pages per black & 560 pages per tri-color (based on 5% coverage)
Whats the shelf life of these inks?
At least 24 months.
If you print only in black and white, do you still need to replace the color cartridge when the black ink runs out?
No, just keep empty color ink inside, replace black one.