こうたく光沢koutaku
1.

A smooth surface that reflects light, creating a shimmering or shiny appearance, often associated with materials like satin or metals.

2.

The quality of having a polished or shiny finish that enhances the visual appeal of an object.

3.

A metaphorical brightness or radiance, often used to describe enlightenment or spiritual illumination.

Example:

この指輪は光沢をうしなった。

こうたくざい光沢剤koutakuzai
1.

A substance used to enhance the shine and reflectivity of a surface, giving it a polished appearance.

2.

An additive that improves the visual aesthetics of a material by providing a smooth and glossy finish.

3.

A formulation designed to elevate the brightness and luster of products, often used in various industries for aesthetic appeal.

4.

A chemical compound applied to surfaces to create a gleaming effect, often utilized in cosmetics, plastics, or coatings.