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Fotospeed SLT20 Selenium Toner is a liquid toner that is supplied in a single part concentrate. It is specifically designed for the toning of fiber- and resin-coated black & white papers, to produce a wide range of subtle warm purple black tones or at higher dilutions for archival permanence techniques.
The shade of the tone can be fine-tuned by simply adjusting the dilution and the length of time the print is allowed to stay in the working solution. While resin-coated papers can be slow to react with selenium, particularly the variable contrast papers, papers with chlorobromide emulsions will produce very effective results.
The working solution will keep for two (2) months in a bottle and for at least a week in the open dish. Concentrates will keep for at least one (1) year in the original bottle.