Keep color documents moving with a genuine Lexmark yellow toner cartridge engineered for the CS/CX421 platform. The 78C00YG Return Program cartridge is designed to deliver consistent yellow output, stable image quality, and reliable day-to-day performance in environments where print accuracy matters. As an OEM supply, it helps preserve the print characteristics your Lexmark device was built to produce. That matters when teams are printing customer-facing materials, internal reports, or color-coded documents that need to stay legible and consistent across runs. The Return Program format also supports cost-conscious procurement without moving away from genuine Lexmark chemistry and cartridge design. For IT and purchasing teams, the value is in fewer variables: known compatibility, verified OEM supply, and a cartridge built for the printer family it serves. The TAA designation makes it suitable for organizations with sourcing requirements tied to compliance or public-sector purchasing. If you need dependable color output from a cartridge that aligns with the printer’s original engineering, this model fits that brief.