Barro Negro Quema Antigua BowlsBeautiful barro negro bowls have arrived, these food safe clay pieces are a beautiful addition to a home. Barro negro is a type of pottery only found in San Bartolo Coyotepec, Oaxaca and crafted using traditional methods. The black color comes from the clay itself, enhanced during the firing process. 6 6. 25 x 6 6. 25 x 2. 75. Approximate measurements, all bowls are made by hand and will differ.