Low friction additive for epoxies?

The title says it all…West System sells a graphite powder to mix into their epoxies to create a low-friction surface, HOWEVER, the graphite will also result in a black epoxy color, which wouldn’t be terribly appealing in my application.

Any ideas for other additives that could be used? I’d like to put together a test trial of various different possibilities…so I’ll entertain any ideas. Thanks!