NO! The glaze surface has cracks that can possibly hold substances (food, dust, dirt) in it and produce bacteria. Is crazed or crackled glaze on pottery food safe? How to remove stains from old crackled or crazed vessel? The effect on the bottom picture is by using a Raku setup with a crackle white glaze that cracks by the rapid cooling before entering the reduction / smoke chamber. For more about firing glass with pottery, visit Combining Glass with Pottery. The effect in the top picture was accomplished by melting and fusing glass on the pot. There are cases where Crazing / Crackle effect is a desired effect like in the pictures on the left (click to enlarge). Therefore, dinnerware pottery should be uncrazed ware. Craze lines can also harbor bacteria or germs. Generally, crazing is considered a glaze defect because the vessel can be significantly weaker than an uncrazed pot. Some vessels from the same manufacturer can craze more or less than other vessels depending on the clay or glaze batch / lot, vessels usage and exposure to temperature extremes, etc.
We (Lakeside Pottery) know of cases where the "pinging" sounds of newly developed crazing lines go for many years.
A craze pattern can develop immediately after removal from the kiln or years later. It happens when a glaze is under tension. Glaze crazing or glaze crackle is a network of lines or cracks in the fired glazed surface.
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