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"Spectrophotometry Ensures Consistent Mortar Coloration"

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"Using Hitch Standardization to Ensure Color Consistency Across Pharmaceutical Manufacturing Sites"

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"Using Spectrophotometers to Create Consistency in Colored Contact Lenses"

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"What Is the Best Way to Measure the Color of Citrus Juice?"

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"What Is the Best Way to Measure the Color of Fruit Juices?"

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"What Standard Do I Use to Verify Yellowness Index Performance?"

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"When Is Sample Averaging Appropriate in Color Measurement?"

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Spectrophotometry Ensures Consistent Mortar Coloration

Posted on Feb 10, 2026 by HunterLab

The color of mortar contributes to the aesthetic of any brick structure. Image Credit: Unsplash user Francesco Mazzoli

It’s the same old story. Brick gets all the press, but it’s really the mortar that’s holding everything together. Which means that, for architects, contractors, homeowners, and mortar manufacturers, the color of mortar is every bit as important to the overall aesthetic of a structure as the color of brick. While few may notice or comment on a mortar color that perfectly complements the hue of a building’s brick, incorrectly colored mortar can become glaringly obvious to even the casual observer. For this reason, contractors pay close attention to the mortar color specified by architects and desired by homeowners. Manufacturers, therefore, must closely monitor their products to ensure they continually produce the mortar colors they advertise. This is especially true for manufacturers who fill special color orders from architects, mixing to the preference of their customers.

Architects choose mortar to match the color of their materials. Image Credit: Unsplash User Mike Tinnion

Posted in Color In Building Materials

Using Hitch Standardization to Ensure Color Consistency Across Pharmaceutical Manufacturing Sites

Posted on Feb 06, 2026 by HunterLab

Large-scale pharmaceutical companies benefit from using Hitch Standardization because these calculations help ensure product color consistency across multiple lab locations. Image Source: Shutterstock user Intarapong

If you’ve ever purchased your favorite brand of over-the-counter medication while you’re on vacation, you know that brand-name pills, powders, and liquids often look exactly the same no matter where you are in the world. Even when you travel thousands of miles away, your preferred brand of allergy tablets will likely be the same reliable shade of bright orange, whether you’re buying the tablets in London or New York. In order to supply medications to these many different cities, large-scale pharmaceutical companies typically operate hundreds of manufacturing facilities around the world.  

But with so many different manufacturing facilities, how do pharmaceutical companies maintain precise color consistency in their products? They accomplish this by standardizing their manufacturing and testing process. More specifically, large-scale companies use methods like Hitch Standardization to ensure that all of their manufacturing facilities perform color quality control tests in precisely the same way. By standardizing the color quality control process across different manufacturing locations using Hitch Standardization, you can produce medications that are perfectly consistent in color.

How Color Consistency Benefits the Pharmaceutical Industry and Consumers

Color quality control is a vital aspect of the pharmaceutical industry. Not only can consistent color be a sign of proper formulation and a significant safety mechanism, it also deeply impacts consumer perception of medication. Additionally, manufacturers of brand name medications rely on color consistency to help them gain a greater share of the market and establish their brand identity in the eyes of their customers. For these manufacturers, the product’s unique trade dress (the appearance of the product) could significantly increase a customer’s loyalty and trust in the brand.1

And color consistency isn’t just important for over-the-counter medication manufacturers; pharmaceutical companies that produce prescription drugs also have to ensure that their products are consistent in color, in part due to the effect color has on both patient behavior, including adherence. For example, studies have shown that people are more likely to take their prescribed medications as prescribed when they see that their pills are the same color every time they refill their prescriptions at the pharmacy.2 If the pill color suddenly changes, then people are less likely to take them as prescribed. As such, color consistency isn’t merely a marketing tool—it can have a very real impact on patient health and wellbeing.

Large-Scale Manufacturers Often Struggle with Color Consistency

Although color consistency is critical in the pharmaceutical industry, it can be very difficult to achieve, especially for large-scale companies. Many large pharmaceutical companies manage hundreds of different test labs and manufacturing facilities around the world. For example, Johnson & Johnson oversees a network of 120 separate manufacturing facilities in more than 60 different countries.3 With so many manufacturing and testing facilities operating simultaneously, it can be challenging to identify and enforce consistent sample measurement standards. This is why many pharmaceutical companies use Hitch Standardization to ensure that every product they create is being measured in exactly the same way.

You can gain better color quality control over your pharmaceutical products when you test these products using a standard, well-defined method. Image Source: Shutterstock user showcake

Posted in Color In Pharmaceuticals

Using Spectrophotometers to Create Consistency in Colored Contact Lenses

Posted on Feb 06, 2026 by HunterLab

Spectrophotometers can help you determine how translucent or opaque your contact lens pigmentation is, improving quality. Image Source: Unsplash user Daniil Avilov

Using colored contact lenses, a professional cosplayer is able to completely transform her appearance within seconds. One moment, she’s a brunette with rich brown eyes. But after popping on a pair of bright purple contact lenses (with a wig to match), she suddenly transforms into a cartoonish alien character that barely resembles herself.

Since the invention of cosmetic colored contact lenses in 1969, cosplayers, makeup artists, Halloween trick-or-treaters, and everyday contact lens users have used colored contacts to alter their original eye color.1 However, in order to completely cover someone’s natural eye color, these contact lenses need to have enough pigment to hide the iris’ original hue. This can be a complicated and difficult process for manufacturers; if they don’t inject enough pigment into the lens, the final effect will look muddy while injecting too much may look unnatural. Even if you’re making semi-translucent lenses that are only meant to enhance the wearer’s natural eye color, pigment accuracy is still vital. You have to ensure that the colors look subtle, appealing, and completely natural. Analyzing your lenses using spectrophotometric instrumentation helps you achieve the perfect pigment balance to ensure your customers can create their ideal look.

Unusual patterns are almost always made using fully-opaque contact lens dyes. Image Source: Wikimedia user Anime Evolution

Posted in Color In Pharmaceuticals

What Is the Best Way to Measure the Color of Citrus Juice?

Posted on Feb 06, 2026 by HunterLab

The best way to measure the color of citrus juice, like orange juice, is by using a spectrophotometer, which will accurately handle the unique composition of the natural ingredients. Elements like common citrus juice color indices and color scales and 45°/0° measurement geometry in your testing system will help you adhere to industry standards.

Use the Right Technique to Measure Citrus Liquids

When measuring a citrus juice like orange juice, you'll be testing an opaque liquid. The opacity or transparency of your beverage will determine which mode you'll use for measuring. Opaque juices should be measured in reflectance spectrophotometric mode, while translucent drinks can be measured in reflectance or transmittance spectrophotometric mode.

Measure Your Liquid Samples With a Contactless Method

Posted in Color Measurement

What Is the Best Way to Measure the Color of Fruit Juices?

Posted on Feb 06, 2026 by HunterLab

A spectrophotometer is the best way to determine the color of fruit juices, as it measures color similar to how the human eye works. It's best to maximize objectivity by quantifying color through the use of industry standard color scales. When you measure the color of a juice using a spectrophotometer, the result is expressed in percentage or number form, eliminating room for error and eye fatigue from subjective methods.

Measure Fruit Juices Using the Right Equipment

Fruit juices can vary in opacity, meaning light won't travel through various beverages the same way. Use a reflectance spectrophotometer to measure opaque liquids like guava or orange juice accurately and employ a reflectance or transmittance spectrophotometer for translucent beverages like apple juice. Selecting the right tools helps you produce accurate results.

Posted in Color Measurement

What Standard Do I Use to Verify Yellowness Index Performance?

Posted on Feb 06, 2026 by HunterLab

The Yellowness Index from ASTM International provides a measurable standard for assessing the yellowness in white or light-colored materials, such as plastics. This standard determines the degree of yellowness present, allowing companies to perform quality control processes to maintain product consistency. The test uses a spectrophotometer to quantify the color measurement.

The APHA color system is the most common measurement scale for measuring yellowness in liquids. It serves industries ranging from chemical production to pharmaceutical development.

Materials That Require Yellowness Observations

Various plastics require yellowness observations due to the changes these materials undergo in processing. These plastics include:

  • Polyvinyl chloride (PVC)
  • Polycarbonate (PC)
  • Purified terephthalic acid (PTA)
  • Polyethylene terephthalate (PET)

Yellowness appears in PET due to oxidation. With the increasing use of recycled PET (rPET), manufacturers must measure color to counter yellowness and determine the correct ratio of optical brighteners required to mitigate it.

What Is the Yellowness Index?

The Yellowness Index (YI) measures yellowness due to product changes. The ASTM E313 Yellowness Index is the most common method for determining yellowness in materials like plastics. The standard gives defined indices for measuring the shift from ideal white. It is calculated according to the following formula:

YI = (100CxX - CzZ)/Y

The X, Y, and Z variables are CIE Tristimulus values, which express color and how it is perceived. Cx and Cz depend on the illuminant and observer. During calculations, users choose the values for these coefficients from a table to correspond with spectrophotometer settings. The ASTM E313 combines the calculations into a single value, defining the yellowness amount in a sample. The lower the number, the less yellow the material is.

The YI value is commonly reported as the difference in yellowness between a product sample and the original or reference, designated as delta YI (∆YI).

Posted in Plastic

When Is Sample Averaging Appropriate in Color Measurement?

Posted on Feb 06, 2026 by HunterLab

Carpet samples can be challenging to measure because the texture may make the product appear lighter or darker than it really is. Averaging your sample measurements can help you overcome this challenge. Image Source: Shutterstock user Alena Ozerova

Some textiles are more difficult to test for color consistency than others. A textile manufacturer can easily test a swatch of solid blue jersey fabric because the material is flat, opaque, and homogenous. For these types of smooth, solid textiles, all the manufacturer has to do is take one reading on a spectrophotometer to determine whether the dyed jersey fabric meets the manufacturer’s color standards. But not all textiles are homogenous in color; fabrics like corduroy, heavy knits, and terry cloth have texture variations that making them much more difficult to measure with a spectrophotometer. If the manufacturer measures the color of such fabrics in just one small area of the sample, there’s no guarantee that this measurement will match other measurements taken of the same fabric—move just one inch to the right of your first measurement and you’ll likely find that the color reading is completely different.

When testing for color consistency, how do manufacturers compensate for textured or non-homogenous products like this? One method is to average the color measurements in order to get an overall sense of the product’s color. By averaging your sample measurements, you’ll ensure that your color readings are as accurate as possible, even when working with materials that vary significantly in texture. However, in order to use this method properly, you’ll need to know when it’s appropriate to average your samples and when you should take only a single reading. After all, taking multiple measurements of the same sample can be a time-consuming process, so it’s important to only average measurements for the products that actually require this added level of attention.

Averaging your measurements can help you get an accurate color reading on products like toothpaste, especially those that contain flecks of colorful suspended particles. Image Source: Shutterstock user kikovic

Posted in Color Measurement
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