What Is Causing Blue Spots On Crackle Ceramic Vases

There are several options to try at home for crazing repair.

What is causing blue spots on crackle ceramic vases.

The cause of crazing is the glaze being put under too much tension. A characteristic of 15th century blue and white porcelain for example was the so called heaped and piled effect in which the cobalt blue underglaze was concentrated in certain areas bubbling through the surface of the glaze and turning a deep blue black. On rare occasions these may be larger but mostly they appear as tiny spots. Iron residue contained in the clay moves slowly to the surface of the ceramic body over a long period of time forming small rust spots.

Simple yet elegant this light blue vase adds class and grace to any table setting or mantel display. Glazes are a very thin coating so most will craze quite easily. The tension happens when the glaze contracts more than the clay body does when cooling after being in the kiln. Measures 6 5 h x 4 75 w.

Celadon is a term for pottery denoting both wares glazed in the jade green celadon color also known as greenware the term specialists now tend to use and a type of transparent glaze often with small cracks that was first used on greenware but later used on other porcelains celadon originated in china though the term is purely european and notable kilns such as the longquan kiln in. Use as a vase to display single stems or as a decorative piece on its own. This decorative element changed a lot over the centuries.