The mesmerizing effect of iridescence in porcelain sculptures is achieved through a combination of specialized glazing techniques and precise firing processes. Artists often use luster glazes containing metallic oxides like copper, silver, or gold, which undergo chemical transformations during kiln firing to produce rainbow-like reflections.

The process begins with applying thin layers of specially formulated glazes to bisque-fired porcelain. These glazes may contain nanoparticles of metals or interference pigments that refract light. The magic happens in the kiln, where reduction firing (limiting oxygen) causes metallic compounds to break down and form microscopic crystalline structures on the surface.

Temperature control is crucial - typically between 700-800°C for luster effects. Some artists employ multiple firings, building up layers of iridescence. Others use post-firing techniques like fuming with metallic salts or applying vaporized metals to cooled pieces.

Contemporary ceramicists also experiment with dichroic glazes and optical interference coatings borrowed from aerospace technology. The result is porcelain that shifts colors depending on viewing angle and light conditions, creating ethereal, ever-changing surfaces that captivate viewers.