Hi
Just find a great shop (http://stores.ebay.com/Patten-Graphic-Supplies_W0QQssPageNameZstrkQ3amewaQ3amesstQQtZkm) on the .bay. they offer ortho film in large size and other thing for the printing industry analog or gray area.
They have this paper (http://cgi.ebay.com/Dylux-Blue-Line-Proofing-Paper-12x18-1-Sided_W0QQitemZ290139513214QQihZ019QQcategoryZ4669 5QQcmdZViewItemQQ_trksidZp1742.m153.l1262) in stock. Don't find anything on it with google but wonder if it was cyanotype or diazo???

Does anyone already hear about this paper??
best regards