For domestic reasons, I have the - properly mounted - Cartridge black, PG 40 tries to use only these days. If the order back are not for some time, I would have returned it. While the CL 41 neatly from the packet service sided, does not recognize my printer IP 2600 Canon PG 40. Even not all relevant maintenance tests. The old Cartridge, even if it is low functioning without problem. Too bad, but I will consider whether I continue such purchases through Amazon active .. Hubert Raffelt