Okay, I finally did it. I love how it came out.
Took about three hours. You guys that painted the stitching on your cloth seats have my full respect! I could see a little "dye creep" into the Alcantara, but a quick swipe with a damp cloth pulled most of it out. Since it has a nap to it, it's impossible to see what little dye was left. It's not red, just darker black.
I ended-up first dying the stitching orange, followed by the red. It came out in a shade of red that leans to the orange side.
I've got to admit the orange stitching looked pretty cool, but I really wanted red. I wouldn't hesitate doing it in blue either.
How the light hits it makes all the difference in the world. I was inside my garage with the door open and the overhead flourescents on, and it definitely looked orange/red. No hint of magenta.
When I finished the first head rest, I took it out into the direct sunlight, and wow did it pop. In the sun, it has a metallic look to it. Chalk that up to dyeing silver threads.
I've got some carbon fiber bits coming in sometime soon. Once all is done, I'll take pictures.