Acid is an integral part of the aquatint process, where it etches the metal plate to create tonal effects. The plate is first dusted with rosin particles, which protect certain areas from being etched, allowing for gradations of tone.
LIST I | LIST II | ||
---|---|---|---|
A | Water colour | I | Egg |
B | Tempera | II | Conte Crayons |
C | Pastel | III | Wash |
D | Tonal Drawing | IV | Gum or Resin/Wax |