Redbone,
It's dyed with Fiebings Professional Oil Dye in Saddle Tan.
I have a video on an AIWB holster. The color's different but the finishing procedure's the same.
If you interested, I've got more leather working videos plus some general silliness on my YouTube channel.
https://www.youtube.com/channel/UCOM3hbruUKHov9kquIxXKlA/videos
I'm about to start a few projects, so stay tuned.