As for colours, this was changed because of a request from my boss.
薄い色 = pale/pastel colour (ie light pink, light yellow, light grey)
濃い色 ＝ rich/deep colour (ie vivid blue, true red)
明るい色 = bright colour (ie fuschia, orange like the sun, pink)
暗い色 = dark colour (ie burgundy, dark khaki)
I hope my sad attempt at describing colours has made some sense to you...