Monochrome Platinotype Selective color References External links Chemical toning (formulas and technique): (Book) Photographic facts and formulas (1924) Many various toners (copper, iron, vanadium, selenium, sulphide, etc.)(p. 216) (Book) All about formulae for your darkroom (1942) Selenium, indirect sulphide toning, red chalk, blue and green tones (pp. 44–47) (Book) Kodak Chemicals and Formulae (1949) Selenium, sulphide-selenium and other toners (pp. 39–41) Ilford: Toning prints Sepia toning in a developing tray. Digital "toning": Sepia Toner Application to convert digital images Sepia EffectVintage sepia effect in Easy Photo Effects Sepia toning in Adobe Photoshop Sepia toning in the GIMP Sepia toning in Java Photographic techniques Monochrome photography