Check out Robert Bergman’s exhibit at the National Gallery of Art. He has been a photographer for almost 6 decades. Check out this article about him on NPR. He has developed a printing process that he describes as:
“multiple impression inkjets with various isolation coats of conservator chemicals used to intensify the colors, some of them with three days of hand-applied micro-crystal and waxes over the isolation coats.”
He worked for 14 years to get his show at the National Gallery. He is there until Jan. I think it will be worth a visit. Here is another article on his work.