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Special Effect Glazes


Synopsis


A complete guide to fantastic special effects glazes for studio potters. From drippy and crackle to ash and lichen glazes, experienced ceramicist Linda Bloomfield guides you through the world of special effect glazes. Beautifully illustrated with pieces from both emerging and established potters that showcase stunning copper oxide-blues, metallic bronzes and manganese-pink crystal glazes, Special Effect Glazes is packed full of recipes to try out: from functional oilspot glazes using iron oxide, to explosive lava glazes. In this informative handbook discover how you can create these fantastic effects and learn the basic chemistry behind glazes in order to adjust and experiment with your unique pieces. Discussed are materials and stains, how to find them and how they affect the colour and texture of the glaze, alongside practical fixes to familiar glaze-making problems. Special Effect Glazes is essential if you are interested in creating eye-catching glazes and wanting to develop your knowledge of glaze-making, or experiment with your own formulas to achieve the perfect finish.

Linda Bloomfield (author), Henry Broomfield (photographer (expression)), American Ceramic Society (associated with work)

Summary

Chapter 1: Introduction to Special Effect Glazes

This chapter provides an overview of special effect glazes, defining them as glazes that produce unique visual and tactile effects. It covers glaze types, their applications, and the underlying science.

Chapter 2: Crystalline Glazes

Crystalline glazes create crystal structures within the glaze layer. This chapter explains the principles of crystallization, the role of nucleation and growth agents, and the factors that influence crystal formation.

Example: "Ice Storm" glaze by Ron Roy, which produces iridescent crystals that resemble a frozen landscape.

Chapter 3: Rutile Glazes

Rutile glazes contain titanium dioxide, which can form needle-like crystals. This chapter explores the conditions necessary for rutile formation, the various colors and effects produced, and the potential hazards associated with these glazes.

Example: "Ti-Rex" glaze by John Britt, which creates a metallic sheen and iridescent surface.

Chapter 4: Crazing and Crackle Glazes

Crazing and crackle glazes intentionally create fine cracks or larger cracks, respectively. This chapter explains the causes of cracking in glazes, the materials and techniques used to induce it, and the variety of aesthetic effects that can be achieved.

Example: "Celadon" glazes, which exhibit a network of fine cracks and a subtle greenish hue.

Chapter 5: Flashing and Reduction Glazes

Flashing and reduction glazes are fired in a reducing atmosphere, which creates metallic effects and coloration. This chapter discusses the chemistry of reduction, the role of oxygen deprivation, and the methods used to achieve flashing and reduction effects.

Example: "Copper Red" glazes, which produce a vibrant red color due to the reduction of copper oxide.

Chapter 6: Textured Glazes

Textured glazes enhance the tactile experience with variations in surface texture. This chapter explores the use of additives, firing conditions, and surface manipulation techniques to create rough, smooth, matte, or glossy surfaces.

Example: "Lava Glaze" by Randy Johnston, which mimics the texture of volcanic rock with its rough and pitted surface.

Chapter 7: Luminescent and Reactive Glazes

Luminescent glazes glow in the dark after exposure to light, while reactive glazes interact with specific metal oxides to create unique colors and patterns. This chapter explains the different types of luminescence, the chemistry of reactions, and the potential applications of these glazes.

Example: "Glow-in-the-Dark" glazes, which absorb UV light and emit it as visible light in the absence of light.