Q:

Change color of tab characters in Sublime Text 3 theme

I am using the Fortran text highlighting package for ST3, and I am making a theme using this fantastic homepage. 
But see the image below. Where there are tab characters within the code (not indentation), those are colored in pink. How can I change that color, or remove it?

A:

With some trial and error I found that the property is indeed a variable on this page and it's called Invalid. That is also the name in the .tmTheme file. But on the site there are no such characters in the sample code (that I saw) and the name isn't obviously related to the tab characters in my code. 
The pink was in fact the default Invalid color on the theme editor site.

