Measuring the Color of Protein Powder Using Spectrophotometry Enhances Appeal

measure the color of protein powder
Protein powder needs to be consistent in color and visually appealing to customers, as this improves its perception of quality. Image Source: Shutterstock user Oksana Mizina

From professional athletes to vegetarians and vegans, thousands of people around the world use protein powder supplements to meet their nutritional needs and color is one of the most important factors that consumers consider when they shop for these products. Color not only plays a significant role in sensory appeal and flavor perception, but color consistency is also an important indicator of quality, as consistency can only be achieved through a refined manufacturing process. In fact, unwanted color change can be a sign of compromised product.

Unfortunately, many protein manufacturers struggle with color consistency in their products, as factors like inconsistent ingredients, uneven mixing, and environmental conditions can impact the color of the powder. This is why you should thoroughly test the color of your protein powder using spectrophotometric color measurement technology. These instruments allow you to produce more appealing products that are consistent products from batch to batch, ensuring the customer expectations are met both in the short and long term. By focusing on color quality control throughout the manufacturing process, you can produce powders that are as appealing as they are nutritious.

Color Consistency is a Sign of Quality in Protein Powder

Protein powders come in a variety of colors depending on the ingredients the manufacturer uses. For example, if a protein powder contains cocoa, it will be naturally brown in color; likewise, powders made from pea protein often have a slightly green hue.1 However, while the raw ingredients in protein powder have an impact on the color of the product, many manufacturers use color additives or bleaching to achieve consistent colors and optimize visual appeal.

Indeed, researchers have found that customers have strong opinions when it comes to the appearance of protein powders, with white, green, and dark brown colors being preferred by most. One small study found that a majority of consumers prefer protein products that appear dull (rather than bright) in color, as this made the product appear more natural. The duller the appearance, the higher the subjects of the study scored the products on their perceived level of effectiveness and attractiveness; white powder appears pure and free of contaminants, consumers associate the color green with health, and dark brown powders often appear free from unappealing artificial additives.2 This is why many protein powder manufacturers generally aim for one of these three shades when they create their products.

But color can also have practical benefits that go beyond psychological impact, and manufacturers often bleach protein powder in part to make it easier for consumers to identify when the powder has expired or oxidized. For example, whey protein is naturally yellow in color because it derives from cheddar cheese.3 However, when this powder is exposed to heat or humidity, oxidation will cause the powder to yellow further or turn brown over time.4 When this happens, lysine (an important amino acid in the supplement) begins to break down, and the powder may become less effective as a result.5 As such, color change can act as a very real and important indicator of efficacy. Unfortunately, many consumers dislike the product’s natural yellow coloration and find it difficult to tell whether the powder is spoiled because they are not able to discern the degree of yellowing. To address this, manufacturers often bleach whey protein powder to make it appear as white as possible; not only does this increase visual appeal, it also allows consumers to more easily detect yellowing caused by oxidation and, hence, potential spoilage.

Whether you choose to bleach your powder, add food dyes, or use only natural ingredients in your formula, it’s important to test your products for color consistency throughout the manufacturing process. This will help you achieve a desirable look for your protein powder and ensure that your products are free of contaminants.

measure the color of protein powder
Color quality control protocols can help you identify contaminants in protein powder and ensure that your products appear consistent in color. Image Source: Shutterstock user marekuliasz

Overcoming the Challenges of Protein Powder Color Measurement

One of the challenges of measuring the color of protein powder is that it is a particulate product. The small particles of powder may impact the accuracy of your color measurements because the product may appear lighter or darker depending on how the sample is prepared. As a result, many spectrophotometers require that a sample appears smooth and even, a time-consuming process that increases vulnerability to human error. To eliminate extensive sample preparation and minimize risk of error, a spectrophotometer that is capable of testing the color of loose powder products is therefore preferable, allowing you to measure the color of protein powder as-is. The innovative Hunter Aeros is exceptionally suited for this task. Designed specifically for rapid, non-contact measurement of textured and non-uniform samples, the Aeros combines state-of-the-art technology with a user-friendly design to optimize accuracy and efficiency of color measurement.

To use the Aeros, you simply place the loose powder on the large sample holder; there is no need to press the powder or perform any laborious preparations. The spectrophotometer will then automatically adjust the sensor height to get the most accurate reading, taking the texture of the sample into account. From here, the Aeros takes multiple measurements as the sample platform rotates, capturing a total of 35 measurements in 5 seconds. It then averages these measurements to provide a comprehensive analysis of the sample as a whole.

One of the greatest benefits of the Aeros is the size of the sample you are able to analyze. With the largest sample area measurement in the world, the Aeros can be relied on to capture color data that is truly representative of a batch, whereas smaller samples may not accurately reflect the entire batch of powder. This helps you optimize color consistency while minimizing the number of samples that must be taken from each batch in order to obtain trustworthy results.

scoops of protein powder
The color of protein powder varies depending on the type of ingredients used to make it. Image Source: Shutterstock user RobsPhoto

Creating a Quality Protein Powder Product

In addition to ensuring color accuracy and consistency in the immediate term for in-production powder, there are a number of additional benefits to using a spectrophotometer like the Aeros to measure the color of your protein powder products. These include:

  • Refining your manufacturing process. When you create a new protein powder formula, you can create and quantify an ideal color for the product, establishing a color standard. The spectrophotometer will then compare all future color samples of that product to the original standard to ensure that your product stays consistent over time. This is essential not just for identifying out-of-spec product, but for alerting you to potential ingredient or process faults that must be addressed, allowing you to refine your practices to optimize correctness.
  • Streamlining workflow. Because the Aeros is designed to minimize sample preparation, the quality control process can become faster and simpler. This can improve productivity and reduce the learning curve for operators participating in the quality control process. Additionally, operators’ skills can be better put to use on higher level tasks where their contributions can be more impactful.

In the end, advanced spectrophotometric instruments not only help you dramatically improve the quality of your products but also the quality and efficiency of your manufacturing process.

Learn More About HunterLab Innovation

Are you ready to optimize your protein powder products? Contact HunterLab to learn more about our state-of-the-art color measurement technologies. We have more than 60 years of experience designing the most advanced spectrophotometers in the world, including instruments ideally suited for analyzing powdered samples. By combining cutting-edge engineering with user-friendly designs, our spectrophotometers allow you to take color quality control to the next level.
Perfect Your Summertime Clothing Colors Using Instruments From HunterLab

  1. “All About Protein Powders”,
  2. “New Insights on ‘Liking’ And Product Choice”,
  3. “Effect of bleaching whey on sensory and functional properties of 80% whey protein concentrate”, June 2012,
  4. “Susceptibility of Whey Protein Isolate to Oxidation and Changes in Physicochemical, Structural and Digestibility Characteristics”, September 9, 2015,
  5. “Is It Safe to Use Expired Protein Powder?”, April 25, 2016,
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