I don't have a good sense of what is causing it. I've mixed hundreds of tests now across many variations on multiple recipes, all produce the green. It isn't Chromium or Copper, neither are in any of the materials I'm using. I can rule out contamination as I first started working on this 7 years ago, but only got it really producing results in the last year. I've been using materials purchased at various points throughout, so the contamination would have to be consistent for years, and also not