It would appear to me that J and C's Polywarmtone might be repackaged Forte Polywarmtone Museum weight (I don't know of anyone else making a 320 gram paper). And I guess Polywarmtone Chamois might be Forte Polywarmtone Art. Both at a great price, and I'd love to give J and C any support I can. Has anyone tried it?
I just finished my first run of Forte Polywarmtone Museum, and really liked it. In selenium, it takes on a subtle red hue if you get it at just the right time. Wait too long, however, and it goes way red.
I asked J and C, but understandibly, they can't say; license agreements, I guess.
I've used both J&C Classic and Forte Polywarmtone and they are not the same paper. The J&C speed is about the same as Ilford Warmtone; Forte's speed is much slower.
All in all, I like the J&C paper, especially when developed in Agfa Neutal WA.
Not sure if they are the same, but the Forte is very nice for contact prints with the Neutol WA mentioned already
and just as a side note, this paper is now available in the 11x14 size :)