Vintage Oaxaca Mexico Black Pottery Small Footed Floral Pitcher Dona Rosa?

Vintage Oaxaca Mexico Black Pottery Small Footed Floral Pitcher Dona Rosa? Size: 3.75" h x 3" w Very good pre-owned condition Unsigned Doña Rosa, full name Rosa Real Mateo de Nieto, was a Mexican ceramics artisan from San Bartolo Coyotepec, Oaxaca, Mexico. She is noted for inventing a technique to make the local pottery type, barro negro, black and shiny after firing. In the 1950s, Doña Rosa discovered that she could change the color and shine of the pieces by making some changes to how the clay piece is handled. Just before the formed clay piece is completely dry, it is polished with a quartz stone to compress the surface. It is then fired at a slightly lower temperature than traditional pieces. After firing, the piece emerges a shiny black instead of a dull gray.