I like to make maps, and so I renamed a firework star, and put it in a chest. If you drag it over either the "Chest" or the "Inventory" label, they both turn white. I haven't looked at any other items, just the firework star. (They don't have to be renamed, mine just was)

I've done some more testing, and found that by clicking on a xp bottle and holding it, the "Miscellaneous" label turns white and any potion effect you have only have outlines.

Also, just by having the xp bottle in your inventory, all text becomes white, until you move your mouse over it.

If you grab a xp potion, any potion effects (mine where night vision effect # 16 and saturation effect # 23) the box will change into a blank, outline of the effect, still having the effect on.

It's evolved into a huge mess of things changing, I just hope what i'm doing helps you out!