Boston bottle manufacturers: Green bottle beer has become a symbol of high-quality beer.

Boston bottle manufacturer: The glass processing technology has improved, allowing for the removal of this residue, but the cost is very high, making it not worth the effort to use it as glass for non-instrumentation purposes. Moreover, it has been found that green bottles can slow down the spoilage of beer, so in the early 19th century, production of green bottles specifically for beer began, and the tradition of green bottles has been preserved.

Boston bottle manufacturer: Later, we would add ferrous oxide and chromium oxide as colorants to the glass to make it look greener.

Boston bottle manufacturer: Taking back the territory from brown bottles, by the 1930s, it was unexpectedly discovered that beer stored in brown bottles did not lose its flavor over time. "This is mainly because brown bottles can better prevent the effects of sunlight on beer."

Beer exposed to sunlight can develop an off-flavor. Research shows that the culprit behind the unpleasant smell is the iso-alpha acids in the hops. Under light conditions, the bitter components in hops can help in the formation of vitamin B2, and under sunlight, the iso-alpha acids in beer react with vitamin B2 to form a chemical substance that smells like a weasel's fart.

Using brown bottles or some dark brown bottles can absorb most of the sunlight, thus blocking this reaction from occurring. Therefore, the use of brown bottles for beer increased.

Boston bottle manufacturer: However, after World War II, there was a period when the demand for brown bottles in Europe was very high, forcing some well-known beer brands to reluctantly use green bottles again for packaging beer. Because these brands produced good quality beer, green bottle beer quickly became a symbol of high-quality beer. Subsequently, many beer manufacturers followed suit and began using green bottles.

Boston bottle manufacturer: At this time, with the popularization of washing machines and the development of sealing technology, using brown bottles does not produce better quality than using bottles of other colors. Thus, green bottles thrived again.

Boston bottle manufacturer: How are colorful glass bottles made?

So how do we achieve the fading of green glass in the deep blue or transparent beer bottles we see today?

Boston bottle manufacturer: After uncovering the truth about the yellowing of glass, we focused on removing the green from the glass to make it fade. Glass fading is divided into chemical fading and physical fading.

"Chemical fading generally relies on the chemical action of passivators to remove the color from the glass and convert strongly colored cheap iron oxides into poorly colored trivalent iron metal oxides. Physical fading generally involves adding a certain amount of additives that can produce contrasting colors to the glass. Thank you for reading.