When you re-texture a caracter to go over a (or multiple slots) with a low opacity and select a slot after the 'lowest' item in the chest/inventory the character changes the color of all the slots

There's a gif of what happens in attachment

Texture pack:
http://www.mediafire.com/file/j99l82i3gvcq3a7/Texture+Pack.zip

Setblock Command:
setblock ~ ~1 ~ chest{CustomName:"

"}