Quote Originally Posted by newcan1 View Post
PE indicates that HAS can be used as a preservative.....is that all it does? The formula we have been discussing works pretty well, and now I'm wondering what would happen in the context of C41 developer if HAS were omitted? Because it's one of the more expensive ingredients.
AFAIK it is used as a preservative. It is also quite acidic, so be prepared for strong pH adjustments after adding it to your recipe. Unlike Sulfite, it doesn't react with oxidized developer which means it doesn't prevent the dye coupler reaction we need for color processes.