it is a Bronze Alloy and has nothing to do with the ancient tumbaga
Rectangle 28mm x 8mm Cutout Shape Charms for Jewelry Making Metalworking Shape Blank Jewelry Making
They are irregular and not perfect
Oklahoma State With Star Cutout for Metalworking Polished Jewelry Making Blanks
Quantity - 5 Stars
Brass 26g 12mm Blanks Square Lotus Flowers Texture Cutout for Stamping Texturing Blank skull ring it is a Bronze AlloyBrass 12mm Blank Square Lotus Flowers Stamping Texturing Metalworking Blanks, C 012, Type of Metal Brass, Grade of Metal First Grade, Gauge of Metal 26 Gauge , Measurement 12mm, Texture Lotus Flowers, Quantity 8, These are nice and lovely textured metal, hard to do, unusual as well! Materials: stamping, cutout, blank, lotus flowers, texture metal, blanks, jewelry, metal, brass.