Org-mode strike-through color

emacs, emacs-faces, org-mode

Solution

Customize the `org-emphasis-alist` variable with M-x customize-variable. Find the list entry where the "marker character" is `+` and choose the "Font-lock-face" option in the "Value menu" popup. Input the value of a face of your choosing, whose exact look you can customize the usual way, for example with M-x customize-face.

Or, more succinctly:

(require 'cl)   ; for delete*
(setq org-emphasis-alist
      (cons '("+" '(:strike-through t :foreground "gray"))
            (delete* "+" org-emphasis-alist :key 'car :test 'equal)))

Problem

Strike-through texts (like this: +text+) in Org-mode are black by default. I want to make them gray. The problem is, I can't find the place to customize it. I've tried `M=x describe-face`, and the result is "default face", which is puzzling. Doesn't Org-mode have a place to configure the strike-through color?

Original source