On Monday, 12 Jun 2017 at 21:36, edgar@openmail.cc wrote:

[...]

> Ok. I got it (with a minor glitch). If someone can help me to get the 
> right colors on the screen (my screen is black; the \tensor symbol is 
> also black), I would appreciate it. Now I can export to ODT with my 
> custom symbols and the bmatrix environment.

Check out org-format-latex-options.  I have, for the same or similar scenario:

#+begin_src emacs-lisp
  (setq org-format-latex-options
        '(:foreground "white" :background "black" :scale 3
                      :html-foreground "Black" :html-background "Transparent"
                      :html-scale 1.0
                      :matchers ("begin" "$1" "$" "$$" "\\(" "\\[")))
#+end_src

-- 
: Eric S Fraga (0xFFFCF67D), Emacs 26.0.50, Org release_9.0.7-531-g530113