Keeping properties of Flemish toner

Discussion in 'B&W: Film, Paper, Chemistry' started by Roscoe, Mar 7, 2008.

  1. Roscoe

    Roscoe Member

    May 25, 2006
    Medium Format
    For you chemistry gurus;

    Given these formulas for sodium sulfide/selenium toners:
    Dassonville T56 Toner
    Chemical Amount
    Water 100ml
    Sodium Sulfide 25g
    Selenium powder 5g

    Flemish Toner
    Chemical Amount
    Water 750ml
    Sodium Sulfide 40g
    Selenium powder 1g
    water to make 1000 ml

    What would be the keeping properties of the stock solutions under optimum conditions?

    Also, any guesses as to the differences in image tone, and how might varying the ratio of sulfide to selenium affect this?

    Thanks for whatever wisdom anyone might have.