Kinsai (金彩) is a traditional Japanese textile technique originating in the late 16th century (Azuchi momoyama period) that decorates silk fabrics by applying gold leaf using lacquer or adhesive.

Kinsai is the meeting of two fundamentally different materials: a precious metal applied to a protein-based fiber, silk, creating surfaces that respond dramatically to light.

A metallic surface reflects light differently from silk. As the fabric moves, the angle of reflection changes, while the silk beneath absorbs, scatters, and softly returns light. The result is a surface that appears to shift between brilliance and shadow.

For centuries, Japanese textile artisans developed these effects through accumulated material knowledge. They learned how metal, adhesive, dye and silk would interact and how their combination could transform a flat textile into something visually dynamic.