Sakura Solid Paint Markers - Permanent Waterproof Paint Pens for Windows, Wood, Glass - Vibrant Fluorescent Pink (1 Pack) - Ideal for DIY Crafts, Sign Making, and Artistic Projects

I use the black to fill in stampings in brass & copper. Sakura paint is by far the best at this. I included a photo of the finished project, this particular stamping (not stamped by me) was difficult as it has really deep end and super light stamped area.I used quite a few different options before landing on Sakuras. The paint itself never seems to get dried out until it's exposed to the air. After the paint sets, it's tough and won't be coming off easily. Deep black color. Definitely worth a try!