riopan

例句：

1. 1. The artist uses iron pigment to create his masterpieces.
   这位艺术家使用铁粉颜料创作他的杰作。
2. 2. The painter applied the iron pigment on the canvas.
   画家在画布上涂上了铁粉颜料。
3. 3.The iron pigment is essential for the color of the painting.
   铁粉颜料是这幅画作颜色的必备元素。