Have you ever wondered if it’s safe to touch clay pots during bisque firing? Bisque firing can be intimidating and getting it right is essential to successfully fire the pot. Read on to find out everything you need to know about safely firing clay pots in a bisque firing including when to fire, what type of clay to use, and most importantly, can you touch the pots?
What is Bisque Firing?
Bisque firing is a type of ceramic firing that is used to harden the clay and fix colors. It is a lower temperature firing than glaze firing and is used to set the shape and texture of the pot. Bisque firing is performed after wedging and shaping the clay, but before glazing. The bisque firing occurs between cones 06 and 02. The specific cone number used will depend on the type of clay and the desired finish for the piece.
After the bisque firing is complete, the piece is ready for glazing. Glazing is the process of applying a thin layer of glass-like material to the surface of the pot. This layer of glaze will give the pot its final color and texture. Glazing is a higher temperature firing than bisque firing and is usually done between cones 04 and 01. The specific cone number used will depend on the type of glaze and the desired finish for the piece.
What Happens During Bisque Firing?
During bisque firing, the clay is heated to a temperature of between Cone 06 and Cone 02 in an electric kiln. At this temperature, the water and organic matter in the clay evaporate out of the clay body, leaving behind a hard, brittle structure. This process also hardens any colors applied to the clay. The bisque firing also sets the shape of the pot. The kiln is typically held at this temperature for at least 8-12 hours before the kiln is allowed to cool slowly over the course of 12-24 hours.
What Type of Clay is Used for Bisque Firing?
The type of clay used in bisque firing is usually referred to as “clay body”. This type of clay is a mix of different clays, typically formulated by a professional experienced in ceramic materials. Generally, the main type of clay used in most clay bodies is earthenware clay. It’s important to note that the bisque firing temperature can vary depending on the type of clay used, so it’s essential to use the correct type of clay.
When Should Pots Be Fired in Bisque?
The best time to fire a pot in bisque is after it has been shaped and dried completely. It’s important to ensure that the pot has reached a leather-hard or bone-dry state before it is fired in bisque. This will allow for smooth, even heating throughout the entire piece during the firing process.
What Are the Benefits of Bisque Firing?
Bisque firing has a number of important benefits for pottery makers. Firstly, bisque firing hardens the clay body. This makes it much easier for the potter to manipulate and shape the pot during subsequent glazing, decorating, and hand-building stages. In addition, bisque firing sets the color, allowing for greater control over the final look and feel of the piece.
The Pros and Cons of Touching Pots During Bisque Firing
Touching pots during bisque firing has both pros and cons. On one hand, touching the pot can speed up cooling and may allow for more even drying of areas near the handles. However, touching can potentially cause cracking or damage to the finished pot, so caution should be taken when handling a freshly fired pot.
How to Position Pots Before and After Bisque Firing
Before you begin bisque firing, it’s important to ensure that the pots are properly positioned in the kiln. Make sure that there is enough space between each pot, and that they are not touching or rubbing against one another. It’s also important to remember that any pieces that are touching while they are firing could potentially fuse together in later firings. To avoid this, make sure that there is several inches of clear space between each pot.
Tips for Safely Handling Pots During Bisque Firing
When handling pots during or after bisque firing, it’s important to use caution. The pot may still be hot, so it’s wise to use protective gloves, or at least double check with a heat gun before handling a newly fired pot. If your pottery needs to be moved or handled before the kiln reaches room temperature, make sure there is enough space for air flow to continue around all surfaces of each piece.
Troubleshooting Common Issues With Touching Pots in Bisque Firing
If you accidentally touched two pots together during bisque firing, you may find that they stuck together after being fired. In this instance, gently try to separate them by hand. If they are too stuck together, you can try soaking them in water or carefully using a craft knife to pry them apart. In any case, be careful not to break or chip either pot.
In conclusion, pots can touch during bisque firing, but exercise caution when doing so. Make sure that you position each pot with enough space between them so they will not fuse together during future firings. Additionally, be sure to handle newly fired pots with protective gloves or double check with a heat gun before handling them directly for your own safety.
