Every glaze recipe is a small contract between a glass-former, a flux, and a stabilizer. Silica wants to melt; feldspar lowers the temperature at which it will; kaolin holds the suspension together until the kiln takes over. Ada Lindqvist reads a glaze the way a chemist reads a formula — which is to say, with respect for what she calls the temperament of materials. Copper that gives a celadon in reduction will turn green in oxidation and red where the kiln hesitates. The bucket, she insists, is where the real science happens. A glaze that is not sieved, not weighed, not stirred to the same consistency twice will betray you in the kiln, not in the recipe. Her advice to students is unfashionably dull: keep the notebook, measure everything, and trust the kiln to be exactly as cruel as it is generous.