Before the widespread adoption of photocopiers, mass production of libretti was inhibited.  The number of libretti produced depends on the scale of the troupe and the cast of the play.  Libretti in Cantonese Opera used to be produced in 4 different ways, namely hand copying, clay printing, stencil printing and stereotype printing.  Among these printing methods, clay printing was the simplest and the most cost-effective method, and therefore prevailed throughout the 1930s and 1970s.  In this workshop, students can learn the techniques of clay printing and the skills of making a museum standard mount through our exercises.