I hope this stuff is indeed PX & TX. However, we can do all the shooting and looking we want, but what we need is a scientific test. Arista 100 & 400 shot in identical light along with PX & TX and all souped in the same dev for the same time with the same agitation and then given densitometer and possibly other tests to see how closely they match.
Has anyone does this? Do they want to do it?