1. Gold Leaf:
* This is the most common material used to create a shimmering, metallic glow.
* Thin sheets of pure gold are applied to the page, either by hand or using a special adhesive.
* Gold leaf is often used for backgrounds, borders, and details like halos or crowns.
2. Silver Leaf:
* Similar to gold leaf, but with a cooler, silvery sheen.
* Used less frequently than gold, but can add a dramatic effect.
3. Other Metallic Materials:
* Copper and bronze leaf were also sometimes used, creating a different color and texture.
4. White Lead (Lead White):
* This pigment, while not a metal, can also create a subtle glow when used in a thick layer.
* White lead was often used for backgrounds or highlights.
5. Mica:
* A natural mineral that occurs in sheets and has a reflective, shimmery quality.
* Mica can be mixed with other pigments to add sparkle.
6. Ink with Metal Powders:
* Inks were sometimes mixed with fine metal powders (like gold or silver) to create a subtle shimmering effect.
7. The Page Material:
* The type of paper used also influences the way light reflects off the pigments.
* High-quality, smooth parchment or vellum often produced a richer glow than rougher paper.
8. Light:
* The way light falls on the manuscript also affects its perceived glow.
* Direct sunlight can enhance the brilliance of metallic elements.
It's important to note that the "glow" is not a single, uniform effect. It's created by a combination of these materials and techniques, resulting in a rich and multifaceted visual experience.