Printing coloured strings in help-buffer

[Heime]

How can I print text with colour?   Have made the following and want
vcname and vcfile to print in colour, in the help buffer.


(defun gali-intro (vcname vcfile)
  "TODO"

  (princ
    (concat
     "`" vcname "' is a variable defined in `" vcfile "'.\n\n"
     "Its description is shown below.\n\n")) )

(defun gali-vconst ()
  (with-help-window (help-buffer)
    (gali-intro "gali-minicompl" "gali.el" )))