The Sharp UX-70B compatible black ink cartridge from Castle Ink is a direct drop-in replacement for the OEM Sharp UX-70B, built for Sharp UX-series thermal-transfer fax machines. It’s an economical way to keep your Sharp printer in service without paying OEM prices, while still meeting the print-quality expectations of a business or photo-grade workflow.Black is the workhorse of the set — the cartridge most owners replace first and most often. Castle Ink’s UX-70B is filled with pigment-grade carbon black for dark, dense text and clean bar codes that scan reliably the first time. Every cartridge is assembled with a fresh chip (where applicable), color-balanced ink, and OEM-grade mechanical components, then leak/seal tested before it ships. Castle Ink backs the UX-70B with a 100% satisfaction guarantee — if you’re not happy with print quality or yield, we replace or refund.Compatible Sharp Printers Sharp UX-B700 Sharp UX-B15 Sharp UXB20CN Sharp UX-B30 Sharp UX-B30RA Sharp UX-B35CN Sharp UX-BA50 Sharp UX-BS60 Sharp UX-BD80 Sharp FO-B1600 FAX Product Specifications SKU: UX-70B OEM Reference: Sharp UX-70B Color: Black Cartridge Type: Compatible (non-OEM) Product Family: Sharp UX-70B Warranty: Castle Ink 100% satisfaction guarantee Shipping: Free U.S. shipping; same-day dispatch on orders before 2pm ET Frequently Asked QuestionsWill using the UX-70B void my Sharp printer warranty? No. Under the U.S. Magnuson-Moss Warranty Act, your printer manufacturer cannot void your warranty solely because you installed a compatible (non-OEM) cartridge.How does print quality compare to the genuine Sharp cartridge? The UX-70B is built to match OEM ink densities and color profiles, so day-to-day output should look essentially identical. If you ever see a difference, our satisfaction guarantee covers a free replacement or refund.How fast will my order ship? Orders placed before 2pm ET ship the same business day from our U.S. warehouse with free standard shipping. Faster options are available at checkout.