紫胶提取物（从 lebbeck 树上的紫胶昆虫中提取）

Amount used
2% (light color) to 10% (deep color) weight as the fabric

Summary
Extract from lac insect on Lebbeck tree
You can learn the history of Lac-dye from this page

Dying method
Dissolve in hot water and use. Add a little vinegar to make the color brilliant.