Question time . . . . ZnO

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Unit 6 Topic 7
Oxide Qualities
Which of the following qualities is unique to zinc oxide?
ZnO has a low coefficient of expansion useful for controlling crazing.

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Glazes with ZnO may be prone to cracking during drying after application.
ZnO enhances cobalt and copper colourants.
In sufficient quantities ZnO will generate large crystals.
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