How to define custom formatting (“faces”) in org-mode for agenda lines by priority?

Question

I'm using org-mode 7.8.11 with Emacs 24.1.1 and I want to change the colors used to display agenda lines, so that e. g. all lines with priority "A" are shown in red bold font.

I tried to change the variable org-priority-faces but it has no effect:

 org-priority-faces is a variable defined in `org-faces.el'.
 Its value is (("A" :foreground "#E01B4C" :weight bold)
 ("B" :foreground "#1739BF")
 ("#C" :foreground "#575757"))

What am I doing wrong? Could other configurations overwrite this new setting?

Answer 1

I customized variable org-priority-faces and it created the following line in my .emacs

(custom-set-variables
;; here there is customization for other variables 
    '(org-priority-faces (quote ((65 . "DeepPink") (66 . "firebrick") (67 . "tomato"))))
)

65, 66 and 67 are ASCII codes for A, B and C priorities.

Emacs displays colours correctly in agenda but only [#A], [#B], ... strings, not the whole line.