ABSTRACT
Prints can be made to last longer without fading by using archival toning. Today, the most commonly used archival toner is selenium. Selenium toner changes some of the silver, to silver selenide. At very low concentrations the toner is used to produce archival toning. Selenium can be used to tone the darker parts of an image leaving the highlights toned by a sulphide tone. The effects may not be visible as a colour shift but the print will outlast an untoned companion print and be more resistant to fading from either light or from chemical sources. There is little observable effect on the image though greys may look a little more like graphite greys. Selenium toning produces a slight increase in image density.
