What is the reflectivity of gold pigment?

The reflectivity of gold pigments can vary depending on the specific pigment type, particle size, shape, and manufacturer's formula. Generally speaking, the reflectivity of gold pigments is relatively high because the appearance of gold is related to the high reflectivity characteristics of metals.
The reflectivity of gold pigments is usually very high in the visible spectrum range, reaching or approaching 90% or more. This means that most visible light is reflected by the golden pigment and not absorbed. This is a key factor in the golden appearance, allowing it to produce a bright metallic luster in applications such as coatings, paints, plastics, and cosmetics.
It should be noted that the reflectivity is also affected by the shape and particle size of the pigment. Smaller particles typically produce a more uniform and delicate metallic luster, while larger particles may produce more pronounced reflection effects and a grainy feel.