anybody ever do this diy leather stitch dye?
 

Just get some SEM vinyl dye in the color you want and spray some in a small cup. Using a fine tip hobby brush, dab it on the threads. The threads will pull it off the brush and soak in. Worked great for me when I went from Saddle to Red.

I used a green fabric pen to do mine. Some people do sharpies but those don’t wipe off as well

ZIG Memory System (fine tip markers) available through Amazon. Waterproof, Lightfast, Fade-Proof.