Wordless Wednesday: Color-Coded Colors

Three kinds of grey colored pencils.  The untaped one is a different brand; the taped ones are Prismacolor Premieres.

  Without the tape, it's easy to tell which Prismas are darker or lighter than the others.
But it's hard to tell the cool/cold greys from the warm ones and the French greys.
  So, color-coding.  Now  i know at a glance which are bluish, which are yellower, and which are "ooh la la!"