Chuck,
Sublijet (Sawgrass Technologies) and ArTainium (Tropical Graphics) are definitely different formulas of ink. If TG has changed the formula of ArTainium ink, since they became a subsidiary of SG, or will do so in the future, is anyone's guess.
In the past, one of the sore points for sublimators, was the practice of an ink supplier changing formulations without notification. If the new formulation rendered the same colors, there was really no harm, as long as the formula change was meant to reduce clogging or introduce a blacker black.
It's when the change in formulation was a cost-cutting measure and repeatability of colors became unreliable that people got up in arms. Rightly so.
TOG is pursuing this case, partly, as a matter of principle. Bill Wellborn, the founder, was one of the pioneers in the industry and his son, Ty, who now runs the company, doesn't want to see his father retire, labeled as a patent infringer. Especially, since he was selling sublimation ink prior to the SG patents being filed.
David "The Stunt Engraver" Lavaneri
DGL Engraving
Port Hueneme, CA |