While checking my chemistry in preparation to making some Kallitypes I noticed that the color of the Ferric Oxalate Powder (CAS# 19469-07-9) that I have from B&S is lime green. The Darkroom Cookbook lists its color as "greenish crystalline scales or pearls" but on the Bostick & Sullivan website it lists the color as "bright yellow". Q: Is the greenish version that I have good?
I'm using the Kallitype formula given in the 3d edition of The Book of Alternative Processes by James. It calls for Ferric Oxalate and refers you to its chhemistry section where it is listed as Ferric Ammonium Oxalate, CAS# 2944-67-4 which is green in color. Q: Which of the two CAS's above are correct for Kallitype or are they both valid?
Thomas
I'm using the Kallitype formula given in the 3d edition of The Book of Alternative Processes by James. It calls for Ferric Oxalate and refers you to its chhemistry section where it is listed as Ferric Ammonium Oxalate, CAS# 2944-67-4 which is green in color. Q: Which of the two CAS's above are correct for Kallitype or are they both valid?
Thomas