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Pottery and Ceramics GlazeGlazing Defects And RemediesThere are many things that can go wrong with a glaze. |
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Crazing One of the most common glaze defects is crazing, although in some cases crazing is a sought after effect, in which case it's called a Crackle Glaze. Crazing will occur when the glaze doesn't fit the clay body. The glaze shrinks more than the clay during the cooling causing the glaze to crack like a spider web. Crazing can occur after a piece has been fired. You can hear a bowl or platter making a pinging noise long after firing, this is the glaze cracking. Crazing can also occur over centuries, as can be seen in many older wares, when they were new, they would have looked OK. Remedies:Add silica to the clay body Add silica to the glaze Add alumina to the glaze Soak the kiln Pin holing When small dots of unglazed or depressed areas appear in the glaze surface, this is called pin holing. Pin holing happens when gases in the glaze and clay bubble up to the surface. The gas bubbles pop and a hole appears, which doesn't heal over. Remedies:Fire the glaze higher Soak the kiln Wipe all dust off of your bisque Spray bisque lightly with water prior to glazing Blistering When a glaze has a bubbled, lava like surface, it is called blistering. There are some so called lava glazes which are specifically formulated to blister. This effect occurs when the gases that are released from the glaze become trapped in the glaze form before they can escape and the glaze smooth over. This can be due to underfiring or overfiring. Remedies:Fire Slower
Crawling The glaze pulls together and forms separate droplets on the surface of the clay body. Crawling occurs when the glaze contracts too much during the heating cycle and doesn't get a sufficient chance to smooth over. Another cause may be due to bad adhesion of the glaze, for instance when glaze is applied to a very dusty pot or the bisque is fired to hot resulting in it not being able to absorb the glaze when it is painted on. Remedies:Substitute some of the clay content of the glaze with kaolinSubstitute glaze fluxes such as zinc oxide and dolomite in their calcined form Clean off any dust with a sponge prior to glazing. Shivering Shivering happens when a glaze doesn't shrink as much as the clay body. When this happens parts of the glaze crack and move against each other lifting off from the clay surface. This can be so bad that pieces of glaze will actually fall off the surface. Remedies:Reduce silica in the clay bodyReduce silica in the glaze Reduce alumina in the glaze
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All About Clay The best way of starting out is to take a few lessons. You will probably waste quite a bit in materials when you first get started. Figuring out how to truly make handmade pottery correctly and shape into what you want it to be can be quite an ordeal. The different tools that a normal shop will have can be fun to try. You will soon see which ones you like to use the most and then when you are ready you will know which ones to buy. With the help of the internet, you can now purchase most if not all of your ceramic and pottery tools and supplies online. We are located far from any well supplied dealers and yet working with reliable ceramic and pottery suppliers online has allowed us to recieve most of our orders within a timely manner. When you get all set up, just enjoy the hobby and have fun at it. Some people get pretty serious and start selling their creations at craft fairs and small stores, but others just like to create items for themselves, relatives, and friends. Whichever kind of handmade pottery you desire to endeavor, enjoy the hobby and have fun doing it.
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