Aquatint reversal is a way to create the tonal opposite of an existing plate, reversing white marks to black or vice versa. To reverse an aquatint, offset the original image onto a clean, blank plate. Then dust the entire plate with rosin. The ink from the original image will act as a stop-out and resist acid when etched. Acid can now bite the remaining areas of the plate, creating a reversal of the original image.