Translation guide
Orpiment is a bright yellow mineral used historically as a pigment. In Japanese, it is primarily referred to by its mineral name 石黄 (せきおう) or the traditional pigment name 雄黄 (ゆうおう).
The mineral orpiment or the yellow pigment derived from it.
この絵には雄黄が使われています。
Orpiment is used in this painting.