try here to find nitric acid. http://www.brainerdchemical.com/frameset_cat.htm
this site has a couple of toning recipes too: http://www.bostick-sullivan.com/c_cyano.htm Scott W. ----- Original Message ----- From: "dennis vinciguerra" <vinciguer...@compuserve.com> To: <Pinhole-Discussion@p at ???????> Sent: Thursday, October 24, 2002 8:22 PM Subject: [pinhole-discussion] toning cyanotypes Hello all, Certain cyanotype images work very well in blue, some in brown but then there are those that need to be black. The formula I have calls for nitric acid but I'm not having any luck locating it. Anyone have either a source or another black toning formula ? Thank you, Dennis _______________________________________________ Post to the list as PLAIN TEXT only - no HTML Pinhole-Discussion mailing list Pinhole-Discussion@p at ??????? unsubscribe or change your account at http://www.???????/discussion/
