About "select all unused colour"
This is a screen cap before click "select all unused colour"
I try to click "select all unused colour" and drag the color to trash, it shows white, blue and black colour to me, but not gold/yellow/orange these kind of colours
Ps:I used black and blue for type/fonts, just I don't have show in this picture
Besides, Is someone knows how to state colour specification for CMYK, PMS, Black & White or Grayscale versions?

