We are encountering problems in the making of ferric oxalate.
Until now we have used ferric oxalate from a small lab with very good results, which was fabricated from a standard recipe. However we are working on a larger project and need more ferric oxalate than they can produce on a regular base.
Subsequently we purchased ferric oxalate crystals from ProChem in Rockford, IL. We solved 27g crystals in 100ml distilled water in a glass beaker. We where using a magnetic stirrer with a hot plate at 100degF and stirred it for 30 min. The color was a clear amber yellow. The solution was filtered with no trace of residuals. No metal was in contact with the solution.
We coated the Revere paper with a mixture of Pt/Pd and ferric oxalate (1:2:3), developed it in potassium oxalate and cleared it in citric acid and EDTA, just as we normally do.
The result was devastating. The whole surface of the coated area was covered with a gray fog.
Now we are trying again with the Bostick & Sullivan ferric oxalate crystal set, which we purchased trough Inkjet Mall.
Before we will try again, could anybody give us advice what potentially went wrong and what would be the best practice to solve the B&S crystals?
PtPd-scan.pdf (172 KB)
PtPd-scan-1.pdf (172 KB)