Archived posting to the Leica Users Group, 1999/04/03
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]>> >Some toners, like selenium, can contribute to longevity of prints. I >> >believe sepia does not. I heard that Selenium toning involves handling a toxic chemical. How serious is this threat to human health? Dan K.