Has anybody else tried Rapidograph Paper "for pen and watercolor wash" from Koh-i-noor? I purchase a pad (9x12in) on a lark, and tried it for cyanotype with pleasing results. The pad states it is "nuetral pH rated" whatever that means these days . It seems to take the emulsion well, and is very sturdy. Has anybody used it with Pt/Pd or other process?