Since 1999, Collins has manufactured inks for addressing printers that incorporate HP printhead technology. Since then, we have developed hundreds of different black inks, each formulated for different applications within the mailing and packaging industries. We also have fourteen standard colors, and for a minimal charge, we will make as little as one cartridge of a customized color. All of Collins' inks for HP TIJ technology are supplied in brand new HP51645A cartridges.