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 360,365,560,570 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.