Guide
Glass Colors for Glass Bottles: Amber, Clear, or Green?
The color of a glass bottle does more than just affect the appearance of beverage packaging. It also helps determine how much of the incoming light—and which parts of it—reach the bottled product. This can be particularly important for protecting light-sensitive beverages.
Amber, clear, and green glass are the most common types of glass used for beverage packaging. The appropriate glass color depends on the beverage, the level of light protection required, and the desired product presentation.
Why does the color of the glass matter when it comes to beverages?
Light can trigger chemical reactions in sensitive products and thereby affect product quality. The glass bottle acts as a barrier between the product and the environment.
However, it is important to note that not every glass color filters light in the same way. The color of the glass affects which wavelengths of light can pass through the bottle.
For this reason, the color of the glass should not be chosen based solely on its appearance.
Amber glass: high light protection for sensitive beverages
Brown glass—often referred to internationally as “amber glass” —is used especially in applications where protecting the contents from light is important.
Beer bottles are a typical example. That is why brown bottles are widely used in the brewing industry. Glass manufacturers also produce beverage bottles in amber, green, and flint glass for various applications.
Amber glass is therefore particularly suitable when protecting the producttakes priority over maximizing the visibility of its contents.
In addition to the actual fill volume, the bottle’s external dimensions are also important. For example, the height and diameter affect processing on the filling line, labeling, and subsequent packaging in cartons or beverage crates.
Even when they have the same capacity, glass bottles can therefore vary significantly in shape and dimensions.
Practical Tip: When switching to a different type of bottle, don’t just compare the filling volume. You should also check the dimensions, the mouth, the closure, and the requirements of the existing filling equipment.
Clear glass: The drink becomes visible
White glass is also known as flint glass or clear glass. Its main design advantage lies in its high transparency: the color and appearance of the beverage become part of the packaging’s overall effect.
This can be particularly useful, for example, with water, juices, sodas, and other beverages where the product’s visible color is intended to be prominently displayed. Flint glass is used industrially for a wide range of beverage, food, and other packaging applications.
However, this high level of transparency also means that the contents are less protected from incoming light by the color of the glass. For light-sensitive products, it is therefore important to determine whether clear glass is suitable for the specific application.
Green glass: distinctive appearance and light filtering
Green glass is particularly well known in the wine and beverage industries. Like amber glass, it alters the spectral transmittance of the container and can therefore offer additional light protection compared to clear glass. However, the specific protective effect depends on the glass composition and color.
In addition to its functional properties, design often plays an important role in green glass. The color of the glass is an integral part of the traditional or desired brand image for many wine and beverage packaging products.
Which glass color offers the best protection from light?
A blanket statement such as “tinted glass protects against UV light” would be too vague. The key factor is the spectral light transmittance of the specific glass tint.
For practical purposes, however, the following can be noted:
Amber glass is used when a relatively high level of light protection is required.
Green glass provides a certain degree of light filtration and combines this with a distinctive design.
Clear glass maximizes the visibility of the product, but because of its color, it provides significantly less protection against incoming light.
For beverages that are particularly sensitive to light, the necessary protective effect should therefore be tested on a product-by-product basis.
Which glass color goes best with which drink?
The type of beverage is an important starting point, but it is not the only selection criterion.
Light protection plays an important role when it comes to beer, which is why amber glass is so widely used.
Depending on the type of wine, tradition, and design, green, brown, and white glass are all used for wine.
For juice, lemonade, water, and other non-alcoholic beverages, greater emphasis may be placed on the visibility of the product’s color, which is why clear glass is often a good choice.
However, a rigid rule stating that “Beverage X always requires glass color Y” would be too simplistic. Product formulation, light sensitivity, distribution, storage, and the desired brand image should all be considered together.
Integrating Glass Color and Packaging Design
The color of the glass is both a technical feature and a design element.
With clear glass, for example, the beverage itself can account for a large part of the visual impact. Amber glass, on the other hand, conveys a different impression and is often directly associated with certain beverage categories. Green glass can also create a high level of brand recognition.
That is why the decision should not be made in isolation. The color of the glass, the shape of the bottle, the label, the cap, and the beverage should be considered as part of an overall packaging concept.
Also consider availability
In addition to product protection and design, another factor plays a role for commercial bottlers: availability.
Not every bottle type is available in every glass color at all times. Therefore, anyone who regularly needs larger quantities should check—when making their selection—which combination of bottle shape, glass color, and closure can be reliably sourced.
If necessary, it may be helpful to identify suitable alternatives in advance.
KP Glas assists beverage manufacturers and bottlers in selecting and sourcing suitable glass bottles and in evaluating available alternatives.
The availability of a specific glass color should also be taken into account when selecting bottles for the long term. To learn how to plan for procurement and alternatives with foresight, read our guide, “Supply Security for Glass Bottles—Avoiding Supply Bottlenecks.”
Amber glass, clear glass, or green glass—an overview of the options
| Glass Color | Characteristics | Particularly relevant when … |
|---|---|---|
| Amber glass | High light protection, distinctive dark appearance | Product protection is a top priority |
| Clear glass | High transparency | the beverage is to be displayed |
| Green Glass | Light Filtering and Distinctive Appearance | Design and a certain degree of light protection are to be combined |
Finding the Right Glass Bottle
The color of the glass is just one of several selection criteria. Equally important are the filling volume, bottle shape, mouth, closure, and the requirements of the filling line.
For those who are just starting to make their selection, this basic guide provides a step-by-step overview:
For an overview of available bottle types: