Glazing is a crucial step in the ceramic process, transforming raw clay into vitreous and aesthetically pleasing objects. Keeping a detailed glaze log is an indispensable tool for ceramics enthusiasts, allowing them to track, experiment, and refine their glazing techniques to achieve consistent and desired results.
A glaze log is a written record that documents every glaze test you conduct. It provides a systematic approach to glazing by capturing information such as glaze composition, application methods, and firing parameters. This data enables you to:
Creating a glaze log is simple and requires the following:
A potter experimenting with a new glaze recorded the glaze composition, firing parameters, and resulting appearance in their glaze log. Upon firing, they discovered a unique crystalline glaze that they would not have discovered without documenting their experimentation.
After experiencing glaze failures, a ceramics artist referred to their glaze log to identify the potential culprit. They realized that the original glaze recipe contained too much flux, causing the glaze to run during firing. By adjusting the flux content, they successfully resolved the issue.
To prepare a large quantity of a favorite glaze, a potter used their glaze log to calculate the necessary ingredients based on the original recipe. This ensured accurate glaze consistency and eliminated the risk of errors in mixing.
Maintaining a comprehensive glaze log is an invaluable tool for ceramics enthusiasts, serving as a repository of knowledge, an aid for experimentation, and a guide to achieving consistent and successful glazing results. By documenting your glaze tests, you empower yourself with the information necessary to master this essential aspect of ceramics.
Table 1: Common Glaze Defects
Defect | Cause |
---|---|
Blistering | Excessive steam or trapped gas |
Crazing | Tensile stress between glaze and clay body |
Devitrification | Cooling too slowly or inappropriate flux |
Pinholing | Air bubbles trapped during application |
Running | Too much flux or improper kiln atmosphere |
Shivering | Fast cooling or inappropriate clay body |
Table 2: Glaze Compositions and Their Characteristics
Glaze Type | Characteristics |
---|---|
Alkaline | High in sodium or potassium, producing high gloss |
Lead-Based | Toxic but produces beautiful and durable glazes |
Ash Glaze | Made from wood or plant ash, giving natural effects |
Crystalline | Forms crystals during firing, creating unique patterns |
Low-Fire | Fired at low temperatures, often used for earthenware |
High-Fire | Fired at high temperatures, producing durable glazes |
Gloss | Produces a shiny, reflective surface |
Matte | Gives a dull, non-reflective finish |
Table 3: Glaze Testing Techniques
Test | Purpose |
---|---|
Test Tiles | Small pieces used to test glaze appearance |
Cone Packs | Determine kiln temperature by melting cones |
Soak | Holding at a target temperature for extended time |
Raku | Firing rapidly to create crackled or textured glaze |
Reduction Firing | Firing in an oxygen-deprived atmosphere to create unique effects |
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