A classic toner for both aesthetics as well as print protection, this 1L bottle of SLT20 Selenium Toner from Fotospeed is well-suited for both resin coated and fiber base black and white papers. It is delivered as a single-part concentrate, and can be diluted to various strengths depending on application. With lower, stronger dilutions, such as 1:3 to 1:12, selenium toner can be used to give prints a range of subtle warm purplish black tones, which can be fine-tuned using different solution strengths or time. With higher dilutions, such as 1:39, selenium toner is ideal as an archival toner to increase a prints permanence and durability.

Once diluted, working solution has a shelf life of approximately two months in a bottle or one week in an open tray. The concentrate has a shelf life of approximately one year in the original bottle.