Discussion
Consider the following statements about glaze faults.
1. Crazing indicates the glaze is in tension.
2. Crawling is usually a wetting problem at application.
3. Pinholing is caused by an expansion mismatch.
Answer: A
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: crazing means the glaze is in tension, and crawling is a wetting failure, where the glaze pulls back from a greasy, dusty or overfired surface leaving bare patches. Statement 3 misattributes pinholing - it is caused by gas escaping through the glaze as it melts, from the body or from decomposing glaze materials, and the remedy lies in the firing schedule rather than in the expansion match.
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