• $color-neutral-white
  #fff
  
• $color-neutral-gray-02
  #f9f9f9
  
• $color-neutral-gray-07
  #eee
  
• $color-neutral-gray-13
  #ddd
  
• $color-neutral-gray-27
  #bbb
  
• $color-neutral-gray-50
  #808080
  
• $color-neutral-gray-60
  #666
  
• $color-neutral-gray-73
  #444
  
• $color-neutral-gray-93
  #131313
  
• $color-neutral-black
  #000
  

To add to these items, use Sass variables that start with $color-neutral- in ./source/css/scss/abstracts/_variables.scss