Shibuichi is a special kind of metal that's made with two different types of metals mixed together - copper and silver. Think of it like mixing your favorite colors together to make a new color!
When the copper and silver are mixed together in just the right way, they create a metal that's not too shiny like silver, but not too dull like copper. It's kind of in the middle!
People in Japan have been making things out of shibuichi for a really long time - like jewelry, vases, and sculptures. Sometimes they even use special techniques to make designs on the shibuichi metal.
So basically, shibuichi is a cool metal that's made by mixing copper and silver together, and it's been used by Japanese artists to make really neat things for a long time!