Compatible Canon BCI-1421 Magenta ink cartridge. The high-yield format compatible cartridges from Webcartridge comply with the strictest quality standards and care for your printer or plotter — just like original cartridges. These large format cartridge contain the highest quality ink for optimal care of your printer or plotter. The cartridges respect the original brand’s patents and are manufactured in an environmentally friendly way. Save money without compromising on quality by buying compatible cartridges from Webcartridge.