Our compatible cartridge for HP831 is formulated to deliver the highest performance with even greater image quality, highly accurate color reproduction & superior print longevity; STS Latex ink is manufactured to the highest standards, specifically for Hewlett Packard's Latex 310,315,330,335 and 360,365 printers. The water-based formulation is practically odorless and environmentally friendly, while the use of our proprietary pigment dispersion gives these inks exceptional print durability in both indoor and outdoor applications. This ultra-premium pigment-based ink also provides exceptional durability & media compatibility. The HP831 is a dead-on match of the original & since it's so incredibly close to the original, there's no need to change the color profile or flush the lines; it's Plug & Print just like the original. STS ultra premium ink is Made in the USA for outstanding quality and performance you can count on.