I used to work in a glass museum. The earliest examples of glass were actually melted enamels applied to decorate clay vessels with color. The earliest glass vessels were essentially thick layers of glass enamel around a simple dirt core. Once the glass cooled they would pick out the core and have a hollow vessel. The Roman’s are attributed with the discovery of glass blowing, around 50 BCE.
There is a fun story where Pliny the elder attributed the discovery of glass to Phoenicians building a fire on a beach and discovering that the sand melted into glass, but that doesn’t fit with the archeological evidence.
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