Tiffany Stained Glass How Do They Get Lead And Solder On Stained Glass/tiffany Lamps To Look Black? Do They Paint It Or What?

How do they get lead and solder on stained glass/tiffany lamps to look black? do they paint it or what? - tiffany stained glass

I would like to know how to lead and welds in the work of stained glass, including Tiffany lamps look like black. Which have lead paint + welds with black paint? If so, what kind of paint do you use?