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<p>[QUOTE=&quot;Francisco G Kempton, post: 4385535, member: 22714&quot;]Another term I learned was &#039;Crackle glaze&#039; in relation to porcelain. One method is to create Crackle glaze, is paint the pottery with Sodium Chloride just before firing in the Kiln. There are many other methods. </p><p><br /></p><p>Old english porcelain, unlike Kaolin rich Chinese porcelain commonly has this crackling or crazing. Much of this is because it would have been used so often and has so much stress over time along with being washed in different temperatures, unlike a chinese vase which sits quietly in a cabinet.</p><p><br /></p><p>Crazing would never be deliberate as it would not be seen to augment the plate, or improve it&#039;s asthetic value. Continental &#039;Hard paste&#039; Porcelain Silcia, feldspar, and kaolin differs from english &#039;Bone China&#039; which has Bone Ash and feldspar and Kaolin and the many experiemnts with Soft paste porcelain has procuded many superior and also inferior results. Some of these different mixtures has resulted in </p><p>porcelain more prone to crazing. I cannot say that i have enough knowledge to understand all the causes but I would guess there are many factors other than just day to day use that saw inferior porcelain produced that crazes,bad kilns, ingredients mixtures, processes, fly by the night factories. Maybe even this was an early form of obsolence before the lightbulb! </p><p><br /></p><p>Deliberate crackling or &#039;crackle glaze&#039; is exceptionally rare, and can be seen in Chinese Guan ware for example but never in a Dinner set.[/QUOTE]</p><p><br /></p>

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