I've used some of the Cool Tone paper from time to time. I like it, but I do not find it dramatically different in most respects, including the purity of the whites, from the standard MG IV. Is there any paper out there with a brighter white than MG IV? I've made comparison prints with several papers and have checked the paper samples at the photo store; so far I've found nothing whiter.
In my experience neither standard nor Cool Tone MG IV responds much at all to selenium toning (fine for me, since I'm more interested in print permanence than in visible change).
In a related matter, one slight disappointment for me is that the MG FB, while generally a great paper, is not quite as white as the RC version. Then again, I normally go with air-dried glossy. Maybe ferrotyping the FB stuff would result in a brighter white.
Does anybody ferrotype anymore? I've never done it, but I understand that keeping the plates in pristine condition is critical--and a real pain.
Konical