Darkroom chemicals are essential for developing and processing photographs. FIXER (5 letters) is a chemical used to make the image on the film or paper permanent. Toners (6 letters) are used to change the color of the photograph, while FIXATIVE (8 letters) is used to protect the photograph from fading. Negs (4 letters) are the negatives of the photograph, and TONER (5 letters) is used to make the image sharper.