The pitfalls of colored plastic bottles

Today, the topic that colored PET bottles are worse than transparent ones is being raised more and more often. Consumers naturally think first about health risks and try to find information. However, there is no reliable evidence supporting this. So why do people say colored plastic bottles are worse? In reality, this statement applies exclusively to PET packaging disposal. Colored bottles require a specific approach, creating additional challenges during recycling.

At first glance, what difference does it make whether to recycle transparent or colored packaging? In fact, there are differences, and we will explain them below.

Why bottles are made colored

Bottle preforms are usually colored due to technological requirements or to attract customers’ attention to the packaged product. In general, there are three main reasons why pigment is added to polymers:

1. ✅ Marketing. Bright packaging helps products stand out among competitors, making them more noticeable on store shelves and attracting buyers. Additionally, colored packaging helps create visual associations with the product (for example, brown for kvass and beer, white for milk).
2. ✅ UV protection. When sunlight reaches liquids, it triggers oxidation and photodegradation processes. This is especially critical for fermented or perishable products, so colored packaging is used to shade the bottle contents, reduce ultraviolet exposure, and help preserve quality.
3. ✅ Defect masking. When recycled PET is used, it often has a grayish or slightly yellow tint. In this case, coloring helps give preforms and bottles a more attractive appearance, hide uneven coloration, and improve the packaging’s visual quality.

The use of pigments in plastic packaging production helps businesses quickly solve sales and product preservation challenges. However, this approach also makes recycling more difficult.

Features of bottle recycling in Ukraine

In Ukraine, recycling infrastructure is still developing. According to information from the State Environmental Inspectorate, as of early 2025, only seven enterprises had licenses for plastic and paper recycling (R3 code), while another 44 specialized in raw material preparation and sorting. These facilities can process around 200,000 tons of plastic annually, but actual utilization remains only 50–60%.

This is largely explained by sorting challenges. Opaque bottles enter the general waste stream, and separating them into dedicated batches requires significant time and resources.

Challenges of recycling colored bottles

The main challenge lies in the physical and chemical characteristics of colored polymers. Transparent PET packaging used for products like soft drinks can be easily recycled and melted back into transparent granules suitable for producing universal preforms.

Non-standard colored bottles create more difficulties because they:

1. ✅ Produce “dirty colors” during recycling. When bottles of different shades are melted together, they create a mixed plastic mass with an uneven dirty-brown color. Due to its unattractive appearance, it can no longer be used for food-grade packaging and is instead used for paving tiles, technical products, or packaging straps.
2. ✅ Cause “blindness” for sorting lines. Colored bottles, especially black ones, are difficult for automated sorting systems to detect. Infrared sensors on conveyor lines often fail to recognize them because black absorbs light. As a result, the system cannot identify the polymer, and instead of being recycled, it becomes waste.
3. ✅ May contain harmful additives. Specific fillers and heavy pigments may be used to color plastic. During melting, these substances can negatively affect the polymer structure. If even a few colored items enter a batch of transparent plastic, they may render the entire batch unsuitable for industrial use.

To recycle colored PET bottles efficiently, an expensive and complex chemical depolymerization process must first be performed (breaking plastic down into monomers and filtering it). Currently, Ukraine does not have sufficient capacity for such processes. As a result, recycling colored PET packaging remains economically inefficient.

It is important to note that PET bottle caps of different colors do not create the same problems. They are made from different materials and therefore remain recyclable. This is why volunteers actively collect and recycle caps, turning the recovered material into jewelry, furniture, plastic products, signs, and more.