They once had their New Platinotype booth here at the annual SF photo show here too. I probably still have their old brochure and price list somewhere. Commercial platinum coating was apparently just a temporary venture. I hope I'm not confusing them with someone else, but that would be an almost unimaginable coincidence, even as per their personal appearance, given my intermittent conversations with them in person over the decades. They hunt out new methods of printmaking, or else try to revive and improve old ones, and hold numerous patents.
I don't see any classes listed on their latest website layout, but they're obviously mentoring a lot of young locals in various fashions of printmaking and bookmaking. I haven't spoken with Donald since prior to my retirement, right around the time they were doing the big NYC subway ceramic image installations in 2017. We were discussing some enviro/health issue roadblocks to a revival of Woodburytype printing. Big tapestry imagery (digitally woven color, not printed upon) seems to be their current thrust. You can still contact them at the Magnolia Editions site.
You might be particularly interested in Donald's articles on paper making, now openly available on the website. His recent personal project, the Parma Portraits, was done on handmade paper, containing his sketches of the Italian medical staff who brought him back from the brink due to Covid two years earlier. It's masterfully done and touching, and on display at a SF art museum.
Another thing which might pique your curiosity, Bob, as an alternative to gum is UV Cured Acrylic Imagery, as exemplified in some of their current 2024 work. Their machine for that is huge. They are somewhat unique as a custom printing service with respect to it being mandatory for the client to be there in person to review the work coming off the machines. They also offer large scale inkjet services and specialized types of CNC image making. Digitized resist-style photogravure has been their proprietary specialty for quite awhile.
I once equipped them for a giant hardwood self-portrait portrait of Chuck Close, their main client at the time, based on an 8x10 film shot. Nearly everything they did for Chuck involved 8X10 film originals. It's pretty amazing how a twenty foot wide hanging tapestry woven from many shades of dyed gray silk can mimic the subtle look of a platinum print. That kind of project would amount to a 7 figure final sale to a museum or private collector.
Sorry folks for a bit of an inside conversation, but if the rest of you want to see just how far this topic of image surface distinctions can range, the website I just listed would give a clue. Magnolia has taken on some incredible projects over the years. Certainly not all of it is photographic per se, but about half of it is.