Patina is used to change the color of your solder lines from silver to a matte black. Novacan Black Patina for Solder and Lead will change your lead and solder to a deep black color. Premixed and ready to use. 
 
Pro Tips:
For best results, it's important to prepare lead by cleaning thoroughly with flux remover and/or rubbing alcohol to remove any oil or other residues from the surface.
Shake well before using, the sulfate will sometimes condense at the bottom of the bottle. 
Clean well after the patina has set.
For copper foil projects we recommend a glass polish such to clean and protect the patina.