Dan, do you mean Powermaster? Yes, after the purple dye showed signs of tinting a bunch of painted stunt models, and receiving complaints, VP dropped the dye. Nobody around here that used Wildcat complained about their red dye, at least not that I heard. Maybe a different type of dye?
I really don't see why they'd pay 1 cent for dye if they didn't have to. I figured it came with Klotz oil Wildcat used.
The purple dye was intentional, according to their model fuel guy. They added it because "people requested it" for some reason, and they tested it and found it didn't stain Monokote, so good to go. I got a batch right before some NATS that was special-made and it was/is water-clear.
FHS/Red Max also stained airplanes and I always asked for "no red dye" to be added. It was still reddish but not nearly as red as if the dye was added and didn't stain either dope or conventional car paint clear to any detectable degree. They were/are still people I wouldn't do business with any more. I figured the residual red came in the oil from the factory (which, despite their claims, they didn't make themselves and was apparently available everywhere.
SIG is also dye-infused, the more nitro, the darker the red, which suggests it might be in the nitro itself, or possible intentionally added for ID purposes.
Brett