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 this inks an 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.