It was discovered that glass forms when melted solid materials are cooled quickly, so that they do not produce crystals. The main ingredients for making glass are sand, soda ash, or potash and lime, melted together at a very high temperature. Since these materials are found in abundance in many parts of the world, the secret of glassmaking could have been discovered in many countries.
The Romans were great glassmakers and used glass as a coating for walls. By the time of the Christian era glass was already being used for windowpanes.
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