Black: Black is the highest-volume cartridge on most C831 print runs, and it is priced accordingly at a higher capacity than the CMY cartridges. The GJIC5(K) delivers dense, sharp black output for text, barcodes, and line work on wide-format labels. On the C831’s dye-based system, black lays down cleanly on coated stock and holds fine detail at the print widths this printer is designed for. If you are printing retail shelf labels, compliance tags, or any label with significant text content, black ink consumption will outpace your color cartridges. Keeping a backup on hand is the most practical way to avoid unplanned downtime. Why order from Pacific Barcode: Pacific Barcode is an Epson ProFocus Platinum Partner, the highest tier in Epson’s authorized reseller program. That means you are buying genuine, factory-fresh ink directly from a dealer Epson has vetted for technical expertise and customer support. Your warranty stays intact and your ink is never counterfeit, refilled, or sitting in a warehouse for years before it ships.
