By converting it into a more stable and archival silver selenide, this dye helps to preserve prints for longer.When used with warm-toned papers it produces cool chocolate brown tones, with neutral-toned papers it produces purple brown tones, and with cool-toned papers it has little or no effect.For optimum print protection, a 1:20 dilution is recommended. If you want to increase shadow contrast and maximum density with minimum tonal change, you can use either a 1:20 or 1:40 dilution. You can also use this toner with black and white film.Features. Converts metallic silver to stable silver selenide. Dilute 1:3 for maximum tinting power. Dilute 1:20 to protect prints. Dilute 1:20 or 1:40 to increase shade contrast and maximum density with minimum tonal change.Package size 946 ml