Bob Washington marked most of his work with initials and date, either incised, inscribed with oxide at biscuit firing, or with a pen after glaze firing.

Sometimes he added a title or a glaze reference.

From 1980, during retirement, Bob Washington threw some two hundred pots to decorate. The shapes initially continued from those of the 1950s and 60s:

The decoration of each pot was elaborately considered. Washington would tape the tracing paper to the pot, draw onto it and remove it to refine the drawing on the reverse before tracing the improved design back onto the pot. Only then would he oxide the pot.