Finally!
Michael's has the MARVY UCHIDA pens for fabric dyeing. Colour # 132, Alizarin Crimson is the closest I have seen to Black Rose yet. It has a brush tip and goes on very accurately.
The stitches are hard to photograph in the garage with flash, but the colour is just right for our Black Rose/Cherry cars.
The bright purple and red attempts on the right were just too far off. This one will be perfect IMO...
Rep points if you are doing this mod to your Black Rose/Cherry/Bordeaux car!