The color ink is fine but the black one is not recognized by my printer. I have a Canon TR4520. I installed this black ink and the printer kept telling me to install it correctly, constantly. So I took it out and put the old one back in and it was fine. I ordered it about 4 months ago as a two pack but didn't need the ink until today. Now my window for a return has closed and I can't get a refund. Bad product, don't buy, I won't be buying it again.