Substance, such as indigo, used to whiten material such as textile or paper, or to give it a blue tint.
Top of the AAT hierarchies....
Materials Facet........
Materials (Hierarchy Name)............
materials (matter)................
<materials by function>....................
colorant (material)........................
dye............................
<dye by composition or origin>................................
synthetic dye....................................
bluing
[bluing 上藍(編號300263384)]。《藝術與建築索引典》。http://aat.teldap.tw/AATFullDisplay/300263384(2024/03/29瀏覽)。