Which decorating technique involves writing on vellum paper or mylar plastic?

The technique that involves writing on vellum paper or mylar plastic is known as overlays. This method often includes placing translucent materials over a surface, allowing the underlying images or text to show through while adding an extra layer of decoration. Using vellum or mylar as a medium offers a unique way to enhance calligraphic pieces with added depth and visual interest.

In contrast, calligraphy primarily focuses on the art of elegant writing itself, without specifically addressing the materials used for overlay effects. Illumination refers to the ornate decoration of manuscripts, often involving gold leaf or brilliant colors, rather than simply applying text. Engraving is a printmaking technique involving incising a design onto a hard surface, which is distinctly different from the practice of applying text or decorative elements directly onto overlay materials.