I find they will darken somewhat no matter what you do but Fruit Fresh works best for me. It seems to be more of a color intensification than actual darkening with the FF. Try some with lemon juice for a comparison and see which you prefer.

Dave

Thanks Dave, I just wasn't sure about the sulfur vs. FF. Have you ever done fruit leather? I'm thinking that might be fun for a change.

Nope. Fruit leathers and dentures aren't really compatible. :)

Dave