This is a superb resource. It explained a lot of things I've wondered about for a long time. I had no idea Craftint of the Doubletone board was related to newspaper comic coloring.
I used a lot of Craftint board years ago. The developer gave off an ammonia smell. I still have a few bottles left but the liquid has evaporated leaving a few crystals. I admire the Craftint work of Roy Crane and Leslie Turner. Used well it was an incredibly versatile tool.