Artist Signed Studio Pottery Glazed Crystalline Bud Vase

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Offered is a studio pottery bud vase with a unique crystalline glaze on the stoneware signed and dated on the … Read more Offered is a studio pottery bud vase with a unique crystalline glaze on the stoneware signed and dated on the bottom (possibly Richard Luedeman - N 92-29?).

The earth-tone crystalline glaze is distinct and a technique where crystals grow in the glaze during the firing process. It is a special effects glaze made primarily of particles of zinc oxide and silica. These two ingredients, along with others, are mixed with water and applied to the piece in a thick paste. While at peak temperature (between 2340 and 2400 degrees F), a chemical reaction takes place between the zinc oxide and the silica forming seed crystals from which the crystals will eventually mature. In nature, crystals form and grow as molten rock cools. So to trigger the crystals to grow, the pottery is allowed to begin to cool. At this point the zinc will seed out as a little dot and start to grow. The temperature is then stabilized for anywhere from five to seven hours to allow the crystals to achieve the desired size. The longer the temperature is held constant the bigger the crystals can become. Once this cycle is completed, the kiln is tuned off, and the crystal growth period ends.

It measures approximately 5" W x 5" D x 5" H, and has a flat round base that is 2.5" in diameter, and a mouth that is 1.75" in diameter. See less