Colour/colours in Chinese is 颜色（yan’se）。Orange in Chinese is 橘色（ju’se）。Blue in Chinese is 青色（qing’se）。Indigo in Chinese is 蓝色（lan’se）。Purple in Chinese is 紫色（zi’se）。
Bonus: Rainbow in Chinese is 彩虹（cai’hon）。
Instead of the usual 'each word is going to be said once in English and five times in Chinese', there will be a little rainbow song sung for you by me! :D
