auctex: Faces

 
 3.1.5 Faces used by font-latex
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 In case you want to change the colors and fonts used by font-latex
 please refer to the faces mentioned in the explanations above and use
 'M-x customize-face RET <face> RET'.  All faces defined by font-latex
 are accessible through a customization group by typing 'M-x
 customize-group RET font-latex-highlighting-faces RET'.