pigment spot

例句：

1. 1.The artist's palette contains many pigment spots.
   这位艺术家的调色板上有很多颜料斑点。
2. 2. The paintbrush left a few pigment spots on the canvas.
   画笔在画布上留下了几个颜料斑点。
3. 3.The old painting had several pigment spots that were hard to remove.
   这幅旧画有几处难以去除的颜料斑点。