There is no built in way I know of. I have done this in org-ref though, and you can see how here: https://github.com/jkitchin/org-ref/blob/master/org-ref.el#L311

John

-----------------------------------
Professor John Kitchin 
Doherty Hall A207F
Department of Chemical Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
412-268-7803

@johnkitchin
http://kitchingroup.cheme.cmu.edu

On Wed, May 13, 2015 at 11:36 AM, Doyley, Marvin M. <mdoyley@ur.rochester.edu> wrote:

Dear all,

I would like to change the face (i.e., color and appearance) of a custom org link type and was wonder if there is a easy way to do this.

Thanks

M