| 11. | Another treatment, which has become more frequent in recent years, is lead glass filling.
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| 12. | Lead glass, which is especially suitable for optical instruments, caused English glassmaking to prosper.
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| 13. | For example, lead glass bonds readily to copper or molybdenum, but not to aluminum.
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| 14. | The gold tone was drawn from the amber lead glass windows in the top doors.
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| 15. | This refers to lead glass as " Jewish glass ", perhaps indicating its transmission to Europe.
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| 16. | The ingredients used to make the glass were lower-cost than those used to make lead glass.
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| 17. | Several textual sources describing lead glass survive.
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| 18. | Although little is known about these materials, it does suggest that lead glass contributed to England's exports.
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| 19. | For more details, see lead glass.
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| 20. | The glass is usually lead glass.
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