Hi all! i just wanted to share this:
http://kitchingroup.cheme.cmu.edu/blog/2016/11/08/New-color-link-in-org-9-0-using-font-lock-to-color-the-text/ in short using the new org 9.0 features one can easily add colors to headers, lines ,words etc with the new color: link types (the code is at the site to add the color: link type) it works fantastically when exporting files and provides a great and easy way to add colors to you org-reveal slides! thx so much to John for his awesome blog (and work :))! Z