An example of detecting milk colorimeter CS-821N

In the milk industry, the color of milk is an important quality indicator, which reflects the composition, freshness and processing of milk, and is of great significance for evaluating the quality and safety of milk. For example, excessive heat treatment or oxidation may lead to yellow milk color, which is usually undesirable, so strict quality control of milk color is required to ensure that it complies with relevant standards and regulations, while traditional color evaluation methods may be affected by human factors, ambient light or observer subjectivity, leading to large deviations in evaluation. However, the desktop spectrophotometer can accurately quantify the color difference by measuring the spectral distribution of the reflection or transmission of the sample and converting it into objective color parameters, such as Lab values. This paper introduces a method of measuring the color difference of milk by using a desktop spectrophotometer.

The working principle of desktop spectrophotometer
A desktop spectrophotometer is an instrument that evaluates the color of an object by measuring the reflected or transmitted light of the color. It splits the light reflected by the object into different wavelengths of monochromatic light and measures the intensity of light at each wavelength. By measuring the color of the object and the target color, the desktop spectrophotometer can calculate the color difference between the two, and then judge the quality of milk.

Measurement procedure
一、Prepare materials
(1) Color spectrum desktop spectrophotometer CS-821N
(2) Standard milk sample
(3) Milk sample to be tested
(4) Colorimetric dishes
Among them, the desktop spectrophotometer CS-821N is the main instrument used to measure the color of milk, and the circular colorimetric dish is the instrument used to hold milk samples.

二、Sample preparation
(1) Pour the milk into the cupola (make sure that the milk is poured into more than 3/4 of the cupola volume)

三、Sample measurement
(1) Turn on the desktop spectrophotometer CS-821N
(2) Set parameters: Select reflection measurement mode, D65 light source, 10° observer Angle, etc
(3) Perform black and white calibration in reflection measurement mode
(4) Erect CS-821N so that the test port is measured upward
(5) Place the colorimetric dish poured into the standard milk on the test port to ensure that it completely covers the test port
(6) Press the measurement key and wait for the instrument to complete the measurement and display the result

(7) Record the measurement results
(8) Clean the comparator and instrument to prepare for the next measurement

四、Result analysis
This experiment can evaluate the color difference of the sample to be tested by comparing the color difference between the sample to be tested and the standard sample. This approach can help milk producers ensure product quality and improve the consumer experience.

At the same time, in the new product development stage, color adjustment and optimization is a key step. By using benchtop spectrophotometers, researchers can precisely measure and adjust the color of new products to meet market and consumer expectations.