{"id":2771,"date":"2025-08-16T17:15:51","date_gmt":"2025-08-16T17:15:51","guid":{"rendered":"https:\/\/friendsofglass.com\/?p=2771"},"modified":"2025-08-27T08:48:43","modified_gmt":"2025-08-27T08:48:43","slug":"why-beer-bottles-green-brown","status":"publish","type":"post","link":"https:\/\/friendsofglass.com\/stories\/why-beer-bottles-green-brown\/","title":{"rendered":"Why are beer bottles green, brown or clear? The science behind colours"},"content":{"rendered":"\r\n
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Whether it\u2019s a bright lager, a golden-orange pale ale, or a dark, rich stout, you\u2019ve probably noticed that beers come in a wide range of colours. But have you wondered the same about their bottles?<\/p>\n

Have you ever stopped to think why stouts usually come in brown bottles, while lagers and pilsners come in green ones?<\/p>\n

In this article, we\u2019ll break down the science behind why some beer bottles are brown, green, or clear. But first things first, to understand the story of coloured bottles, we need to take a look at the beer making process.<\/p>\n\r\n <\/div>\r\n<\/div>\n\n\r\n

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The beer making process<\/strong><\/h2>\n

Beer isn\u2019t just an alcoholic beverage, but a truly crafted experience. It\u2019s produced through a process called brewing, using four key ingredients: barley, hops, yeast, and, of course, water.<\/p>\n

The beer making process begins well before brewing, with the preparation of the grain. In the malting<\/strong> stage, barley and other grains are soaked, allowed to germinate and then dried, creating something called <\/span><\/span>malt.<\/p>\n

It\u2019s not until the malt reaches the brewery, that the brewing process kicks-off. During milling<\/strong>, malt is broken down into small particles, which are then mixed with water (the mashing phase<\/strong>). <\/strong>This produces a sweet liquid (called wort) which is then boiled with hops \u2013 giving beer its unique flavours, bitterness and aromas.<\/p>\n

After boiling<\/strong>, the mix is cooled and combined with yeast during fermentation<\/strong>. Here sugars are converted into alcohol and carbon dioxide, giving beer its characteristic fizziness. As flavours and aromas develop over time, the beer goes through maturation<\/strong>, which varies depending on the style and intended intensity.<\/p>\n

After this maturation period, beer gets filtered<\/strong> clarity and <\/span>smoothness<\/span>,<\/span> and<\/span>, in some cases,<\/span> sometimes <\/span>carbonated<\/span>. Final step is packaging <\/strong>this liquid gold into glass bottles, which preserve beer\u2019s taste<\/a> and aroma for longer.<\/p>\n

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The different types of beer<\/strong><\/h3>\n\r\n <\/div>\r\n<\/div>\n\n \r\n
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Ales<\/h3>\r\n <\/div>\r\n \r\n

One key difference between ales and lagers comes down to yeast and fermentation temperature. Ales prefer warmer environments, so the yeast floats at the surface while fermenting. Their taste can range from fruity to earthy, but because of the fermentation style, ales tend to be stronger and slightly sweeter. Ales usually come in brown bottles, which help protect their flavour and aroma. They\u2019re your go-to choice for a cosy and quiet evening, when you can savour it with the time it deserves.<\/p>\r\n \r\n <\/div>\r\n <\/div>\r\n

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Lagers <\/h3>\r\n <\/div>\r\n \r\n

Lagers are the most popular beer style, usually known for being crisp, clean, and refreshing. Unlike ales, the yeast in lagers ferments at the bottom and at lower temperatures, giving them a smoother, lighter profile. They often come in brown or green bottles and are the perfect choice for quenching your thirst on a hot summer day.<\/p>\r\n \r\n <\/div>\r\n <\/div>\r\n

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Stouts and Porters <\/h3>\r\n <\/div>\r\n \r\n

Stouts are typically darker brown beers, and a fun secret is that they\u2019re actually ales \u2014 the only difference is that their malt just roasts for longer. These dark ales often come in brown bottles and give off chocolate, caramel, and coffee notes. They\u2019re perfect for colder days and can help lift your wintery mood.<\/p>\r\n \r\n <\/div>\r\n <\/div>\r\n

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Other styles<\/h3>\r\n <\/div>\r\n \r\n

From fruit beers to radlers, to non-alcoholic options, which are also becoming more and more popular, beer styles and nuances are endless. What we\u2019ve covered here is really just the tip, or should we say \u2018sip\u2019 of the iceberg. <\/p>\r\n \r\n <\/div>\r\n <\/div>\r\n <\/div>\r\n <\/div>\r\n <\/div>\r\n <\/div>\r\n\r\n \r\n\r\n\r\n\r\n\r\n\r\n\n\n\r\n

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But after all, what\u2019s the deal with bottle colours? Well, you might have guessed it: different beer types also usually come in different bottle colours, and there are three main reasons for this, which we explore next.<\/p>\n\r\n <\/div>\r\n<\/div>\n\n\r\n

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Why are beer bottles green, brown or clear \u2013 and why does it matter?<\/strong><\/h2>\n

Beer bottle colours aren\u2019t just about aesthetics – they can help preserve beer\u2019s flavour, aroma and quality for longer. Whether a bottle is brown, green, or clear will influence how it holds up over time, how much light can get through, and even reflects historical or regional traditions.<\/p>\n\r\n <\/div>\r\n<\/div>\n\n\r\n

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Preserving flavour and aroma<\/strong><\/h3>\n

Glass is a natural protector when it comes to keeping beer\u2019s flavours and aromas as originally intended. It\u2019s not by chance that glass has also been long used to store carbonated drinks<\/a> and wine.<\/p>\n

Because it\u2019s a single-layered material, glass doesn\u2019t require any chemical liners that could interfere with the beer. It also blocks oxygen from sneaking in and making your beer go stale (better to brew safe than sorry<\/em>).<\/p>\n

Whether a bottle is green or brown doesn\u2019t directly affect taste, but it does control how much sunlight gets in \u2014 and that can make all the difference.<\/p>\n<\/div>\r\n <\/div>\r\n\r\n

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Protecting from light damage<\/strong><\/h3>\n

Light exposure is one of the main threats to beer. When beer sits in the sun for too long, sensitive hop compounds break down and react with the proteins, releasing an unpleasant \u201cskunky\u201d smell.<\/p>\n

This is why most beer bottles are brown or green. Brown (amber) bottles are the most effective, blocking up to 99.9% of UV rays, retaining beer\u2019s top-notch flavour for months on end.\u00a0<\/a><\/p>\n

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Marketing and historical tradition<\/strong><\/h3>\n

If brown bottles are so effective, why are green and clear bottles still used? The answer often lies in marketing and history<\/strong>.<\/p>\n

After World War II, when brown glass was in short supply, European breweries began using green bottles. Over time, green bottles became associated with premium brands and higher quality. Clear bottles, on the other hand, are often used for marketing purposes, so that consumers can see the beer inside before <\/span><\/span><\/span>committing<\/span><\/span><\/span> to buying it<\/span><\/span><\/span>.<\/p>\n

While brown bottles have historically been the standard for storing beer<\/a>, green and clear bottles have become part of brands\u2019 identities. It just goes to show how colours, labels, and overall design can really enhance brands\u2019 value.<\/a><\/p>\n

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Now that you know the science (and history) behind coloured bottles, you can impress your friends whenever someone asks, \u201cWhy are beer bottles green or brown?\u201d<\/em><\/p>\n

You can say that it all comes down to three intertwined factors: flavour and aroma, light protection and tradition.<\/p>\n

So next time you crack open a cold beer, remember that brown or green glass isn\u2019t just a random choice, but a crucial one!<\/p>\n\r\n <\/div>\r\n<\/div>\n\n\r\n

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Whether it\u2019s a bright lager or a golden-orange pale ale, you\u2019ve probably noticed that beers come in different colours. But what about their bottles?<\/p>\n","protected":false},"author":13,"featured_media":2773,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":true,"inline_featured_image":false,"footnotes":""},"categories":[23,25],"tags":[],"class_list":["post-2771","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-experience","category-taste"],"acf":[],"yoast_head":"\nWhy are beer bottles green, brown or clear? The science behind colours - friendsofglass<\/title>\n<meta name=\"description\" content=\"You\u2019ve probably noticed that beer bottles come in green, brown, or even clear. 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