Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Compatibility error

The "Will This Work with Your Printer" tool told me that this cartridge would work in my Canon BJC-2110 printer. I purchased it (actually from somewhere else), and it does not fit--it is not the same as the BCI-21 black cartridge. I just wanted to let others who might have the older BJC-2100 series printers know this information.