Dye based inks are much more opaque when printed onto R-Film WP Transparencies than the standard Epson inks that come with the 2400. We recommend using this ink with the AccuRip software but you can also use it as a lower cost FastInk replacement if you are currently using FastRip and FastInk.  It's made out of the same components as FastInk is but now you can get it for a lower price and from a more reliable source.