Why Are Beer Bottles Green in China?

Although beer such as 300ML Amber Beer Bottle has a long history, it doesn't take long to put it in glass bottles, starting around the mid-19th century.

At first, people even thought glass was green. Not only were beer bottles, ink bottles, paste bottles, but even the windowpanes were slightly green. "This is because the original process of making glass was not very good, and it was difficult to remove impurities such as ferrous ions from raw materials, so the glass produced showed a green color," Dr Cao zhenrong, from the institute of physics, Chinese academy of sciences, told reporters.

Later, the glass manufacturing process was advanced, and these impurities could be removed, but the cost was too high, and it was found that green wine bottles could slow down the flavor of beer. Therefore, in the late 19th century, green beer bottles were specially produced to hold beer.

"Later, people will add ferrous oxide and chromium oxide to the glass to make it look greener." "Said Mr. Tsao.

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