Here is a web page with the steps that I use to make ferric oxalate. http://e.neilsen.home.att.net/FerricOxalate.html I'll be happy to answer any questions as best and as full as I'm able. I have been using that method since 1994. -- Eric J. Neilsen 4101 Commerce Street, Suite #9 Dallas, TX 75226 214-827-8301 http://e.neilsen.home.att.net http://www.ericneilsenphotography.com