Sulfamic acid uses?

[craigclu]

I see sulfamic acid listed at various photo chemical sites and have never seen any formulas calling for it. What are the photographic applications for it? I use it as a descaler in my espresso machine and the combination of caffeine and my curiosity had me wondering....

 

[glbeas]

I would tend to believe its used for making bleaches but don't quote me on that.

 

[shinn]

Argyrotype.

Sulfamic acid is combined with silver oxide and something else (FAC maybe). If I remember correctly, my books/notes aren't here. It's another process dependent on humidity. I've burned through a couple batches and negatives a while back but found VDB and Kallitypye more predictable. Although Argyrotype has many more colors that are possible. It is a beautiful process but somewhat finikey.

Happy Days
Mark

 

[Maine-iac]

I see sulfamic acid listed at various photo chemical sites and have never seen any formulas calling for it. What are the photographic applications for it? I use it as a descaler in my espresso machine and the combination of caffeine and my curiosity had me wondering....

It may be one of the ingredients in Ilford's bleach for Ilfochromes. Or is that sulfonic acid?

Larry

 

[cullah]

I use Sulfamic acid to clear platinum/palladium prints (Ziatype method). It works much better than citric acid or sodium sulfite. I use 35 ml/L of H2O. The main ingredient of the Lime Away being Sulfamic acid.