Like any clay, the matrix that works are created on will gradually dry when exposed to air over time. In dry rooms, the matrix may start to have small cracks while working on a project. The problem compounds over time, with cracks increasing in both number and size. Because of this issue, clay monoprint artists need to take care of the matrix that they use.

Shown above is my primary clay matrix after pulling a print. The wooden frame is visible around the clay slab. Left sitting in a typical room, the clay would very quickly begin to dry, cracks would form, and eventually, the slab would shrink and pull away from the sides/frame.

When I am finished working with the matrix, I spray the clay surface with water and then cover the matrix with thin towels.

Depending upon how dry the slab and room are and how long one expects to be away, the towels are sprayed with water or placed onto the matrix already slightly wet. (Soaking wet, however, could muddy the surface clay.)

Finally, a plastic sheet is placed over the towels and matrix, and the edges are tucked under the wooden frame.

(For my smaller student boards, which are used less often, they are then slid into a large trash bag with the drawstring then pulled tight. They still need to be pulled out occasionally to add more moisture. This necessity has led me to gradually keep fewer student boards on hand — one reason I no longer lead larger workshops.)

A clay monoprint artist’s matrix gets lonely and must be visited often! If not, it will express disappointment with a new batch of cracks. On the other hand, give it regular attention, and you’ll find it sticking with you for years!