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decorative:material,
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refractory:coating,
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reflective:material,
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brittle:coating,
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hard:surface,
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finished:item,
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nonmetallic:coating,
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protective:coating,
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ceramic:coating,
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conventional:coating,
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decorative:coating,
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inorganic:surface,
Category Nuances for porcelain_enamel:
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refractory,
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brittle,
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protective,
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hard,
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reflective,
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decorative,
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inorganic,
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conventional,
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finished,
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nonmetallic,
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ceramic,
Simple Categories for porcelain_enamel: