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
Thanks, Eric. Unfortunately, that did not work. It does change the
background and foreground colors, but the \tensor symbol is now
"invisible" (it is black, and the background is also black). The rest of
the equation looks fine.
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