I ordered a pack of 6 HP colour cartridges (refilled), and one cartridge does not have colour (just grey instead o magenta). I tried to contact the company via *******@inkjetsuperstore.ca, but this email address cannot be reached. That's the only way to contact them. So I don't have any way to mitigate the problem. If the product works, you are in good luck. If not, then you can only write a review and never buy from them again.