This is shade 1 black which is used in the black position. The cartridge can be used in any position however. QTR expects this cart to be inserted in the black position. StudioPrint users can insert this in any slot, and it is considered to be printing ink assignment "black". The new MPS inks are designed to be used in conjunction with a gloss optimizer if used with glossy media. However, the inkset shades 1-6 work with current Piezography K6 QuadToneRIP curvesets! Users of 7000, 7500, 9000 & 9500 printers can not use the gloss optimizer because these printers do not support more than 6 inks. However, these inks work terrific on matte and fine art papers so use as you would K6 inks! Roland printer users can utilize gloss optimizer if they can control the printing of the gloss optimizer. We will provide documentation for this shortly.