No tung oil in tung oil varnish?,,that line was started by an article in a high brow wood working magazine some years back. The writer taking a shot at the Formby products and stating there was no tung oil in its tung oil finish. He offered no explanation but the statement has never faded.

That many are 'wiping varnishes' is true,,thinned out w/ mineral spirits and they say that on the container. That's no problem, even a good thing. Thin coats you want, thin coats you get.
It stays usable in the container after it's opened for over a year too. No argon, upsidedown bottle, marbles or tinfoil top w/pinhole.