The painting is mostly three colors -- blue,green and pink.

VOA: special.2010.03.24

What about the kind of cyan-ish, blue-green one? Yup.

那这个蓝绿色的呢？

麻省理工公开课 - 化学原理课程节选

One is that there's four different colors and so you can see red, blue, yellow, green here - four different colors and that's all there are, there aren't more than four.

一是这些梯阶有四种不同颜色,你可以看到红 蓝 黄 绿,恰恰只有四种不同颜色,不多不少

耶鲁公开课 - 生物医学工程探索课程节选