0086 18165740359The color of juice not only affects consumers' first impression, but is also closely related to the product's sensory quality, ingredient stability, and market competitiveness. Transmission colorimetry is an accurate color control technology, especially suitable for transparent and translucent liquids. 3nh liquid colorimeter and spectrophotometer can help food manufacturers ensure product color consistency and improve quality management.
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Basic Principles of Transmission Colorimetry
Transmittance chromaticity refers to the degree to which light is absorbed and scattered when passing through a liquid, which directly affects the visual color of the juice. The following parameters should be paid attention to when measuring:
Transmittance (T%): The percentage of the transmitted light intensity after the light passes through the sample to the incident light intensity. Transparent juice has a high transmittance (such as apple juice T%>90%), while turbid juice has a low transmittance (such as orange juice T%<50%).
Chromaticity coordinates: Quantitatively describe color using the CIE Lab or Hunter Lab system:
- L* : Lightness (0 is black, 100 is white).
- a* : Red-green axis (positive values are redder, negative values are greener).
- b* : Yellow-blue axis (positive values are yellowish, negative values are bluish).
Transparent and translucent liquid color measurement method steps :
a.Sample preparation:
Pour the juice into a transparent cuvette, making sure there are no bubbles or impurities interfering with the light path. For transparent juices (such as grape juice), you can measure directly; for translucent or pulpy juices (such as aloe vera juice ), you may need to filter or dilute to reduce light scattering.
b.Spectral measurements:
A spectrophotometer or liquid colorimeter transmits light of known intensity through a juice sample and records the transmittance at each wavelength. Transmittance is usually expressed as a percentage, for example 100% means complete transmission and 0% means complete absorption.
c.Color calculation:
Based on the transmission spectrum data, color coordinates are calculated (such as L* for lightness, a* for red-green axis, and b* for yellow-blue axis). These coordinates can be compared with industry standards or target values , and the measured data can be saved in PeColor Color Matching Systems to establish a color library for management.
d.applicability
Transparent liquids: such as clear apple juice or lemon juice , scatter less light and provide more accurate results.
Translucent liquids: such as grape juice or sugar cane juice , light scattering may increase errors and require special handling.
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Juice Color Control Applications
The primary purpose of transmittance colorimetry measurements is to support quality control and ensure that the color of the juice meets predetermined standards. Manufacturers can leverage these measurements with 3nh PeColor Color Matching Systems in the following ways:
- Establish a standard color profile: By measuring the initial batch or ideal sample, determine the target color coordinates as a benchmark for subsequent production.
- Batch-to-batch comparison: Color is measured after each production run and compared to a standard to ensure consistency . If deviations are found, corrective action can be taken.
- Process Adjustment: Based on the measurement results, the production process is adjusted, such as changing the fruit blend, modifying processing conditions or adding color correctors to achieve the desired color.
- Long-term monitoring: Regular measurements are taken to monitor color changes over time and detect any potential problems such as deterioration in raw material quality or aging of processing equipment.
3nh Transparent and Translucent Juice Color Measurement Solution
Desktop Spectrophotometer TS8560
TS8560 desktop spectrophotometer has dual functions of transmission measurement and reflection measurement, and includes SCI/SCE (including specular reflection/excluding specular reflection) synthesis technology, supporting SCI+SCE simultaneous rapid measurement. Supporting two lighting modes, pulsed xenon lamp and LED, the repeatability of the reflectance chromaticity value of TS8560 desktop spectrophotometer is ΔE*ab ≤0.01, and the difference between units ΔE*ab is controlled within 0.1, and the data is stable and reliable. It complies with CIE No.15, GB/T 3978, GB 2893, GB/T 18833, ISO7724/1, ASTM E1164, DIN5033 Teil7, JIS Z8722 Condition C standards .
Liquid colorimeter TS4020 is a high-precision color analysis tool designed by 3nh with innovative core technology for liquid color measurement. It adopts D/0 optical structure, equipped with full-band LED light source and high-performance test system, provides a variety of color indexes, including transmittance, chromaticity, color difference, platinum cobalt index, Gardner, Seibert index, petroleum color scale, pharmacopoeia color, etc., supports micro-transmission measurement, and has fast measurement speed. It complies with ASTM D1003/1044, CIE No.15 , ASTM E308, DIN5033 Teil7 and other standards. It is widely used in color measurement needs in the fields of chemical industry, food and beverage, petrochemical industry, pharmaceutical industry, etc.
PeColor Color Matching Software
PeColor color matching software is a color modulation software designed with job orientation. It is suitable for color matching solutions for coatings, plastics, paints, inks and textiles, and can provide fast and accurate color analysis and formulations for various applications. PeColor has the characteristics of easy operation, accurate color matching and strong correction ability. It can be used not only for color matching in laboratories, but also for quality control and color difference correction in workshop production.
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