CATEGORIES

    PhotocoloriMeter

    Overview Knowledge Standards Terms
    A photometric colorimeter measures color by illuminating a sample with a standard light source and analyzing the spectral data of the reflected light, which is then converted into color values. It is used for color quality control in industries such as coatings and plastics to ensure consistency between batches.
    Selection
    When selecting a spectrophotometer, it is essential to consider matching the measurement aperture to the sample size, choose a measurement mode that either includes specular reflection (including gloss) or excludes specular reflection (excluding gloss), confirm that the instrument complies with industry standards such as ISO, and evaluate inter-instrument consistency to ensure data comparability.
    Sample type
    Measurement aperture
    Measurement Geometry
    Color difference formula

    Terms

    UV-Vis Spectrophotometer
    Flame Atomic Absorption Spectrophotometer
    Color matching software
    Fluorescence Spectrophotometer
    Dual-beam visible spectrophotometer
    Atomic Absorption Spectrophotometer
    Fully automatic spectrophotometer
    Dual-beam spectrophotometer
    Dual-beam UV spectrophotometer
    Flame Atomic Absorption Spectrophotometer

    Standards

    Active GB/T 39544-2020
    Natural rubber latex concentrate—Determination of total phosphate content—Spectrophotometric method
    Active GB/T 16258-2018
    Test method for sugar in cotton fibers—Spectrophotometry
    Active GB/T 34323-2017
    Carbon black—Determination of light transmittance of water dispersion—Spectrophotometer method
    Active GB/T 26810-2011
    Visible spectrophotometer
    Active GB/T 27594-2011
    Disperse dyestuffs - Determination of relative strength of presscakes - Spectrophotometer method
    Active GB/T 20675-2006
    General test method in salt industry - Determination of copper ion(AAS)
    Active GB/T 25968-2010
    Test methods of solar transmittance and solar absorptance of materials by spectrophotometry
    Active GB/T 26813-2011
    Double beam UV/VIS spectrophotometer
    Active GB/T 26798-2011
    Single beam UV/VIS spectrophotometer
    Active GB/T 18403.6-2013
    Expression of performance of gas analyzers - Part 6: Photometric analyzers
    Incoming GB/T 27594-2025
    Disperse dyestuffs—Determination of relative strength—Spectrophotometer method
    Active GB/T 43108-2023
    Dyestuffs—Determination of solubility in organic solvents—Gravimetric and photometric methods
    Active GB/T 23993-2009
    Determination of formaldehyde content of waterborne coatings - Spectrophtometric method with acetylacetone
    Active GB/T 13451.2-1992
    Determination of relative tinting strength of colored pigments and relative scattering power of white pigments--Photometric methods
    Active GB/T 9758.1-1988
    Paints and varnishes--Determination of “Soluble” metal content--Part 1:Determination of lead content--Flame atomic absorption spectrometric method and dithizone spectrophotometric method

    Articles

    Use of Fluorescence Spectrophotometer in Measuring Excitation and Emission Spectra of Anti-Counterfeiting Fluorescent Inks
    This article introduces the application of fluorescence spectrophotometry in the spectral measurement of anti-counterfeiting fluorescent inks, including instrument calibration, sample preparation, and methods for measuring excitation and emission spectra.
    Spectrophotometer measures ink spectral reflectance and opacity.
    This article introduces how to measure the hiding power of ink using a spectrophotometer. The instrument irradiates the ink sample, measures its reflectance within the visible light spectrum, and calculates the hiding power using the Kubelka-Munk model.
    The combination of hiding power chart paper and a spectrophotometer enables the digital evaluation of hiding power.
    This article introduces how to combine hiding power cards with spectrophotometers to achieve digital assessment of hiding power.
    UV spectrophotometer for measuring residual monomers in polymer solutions.
    This article introduces a method for determining residual monomers in polymer solutions using ultraviolet spectrophotometry. The principle relies on the characteristic absorption of monomers in the ultraviolet region, calculating their content based on the relationship between absorbance and concentration.
    UV-Vis-NIR spectrophotometer measures the transmittance of anti-reflection coatings.
    This article introduces the method of measuring the transmittance of anti-reflective coatings using a UV-Vis-NIR spectrophotometer. The instrument is based on the Beer-Lambert law, calculating transmittance by comparing the light intensity of the sample and the reference, covering a wide spectral range from ultraviolet to near-infrared.
    Determination of Transmittance of Resin Solutions Using UV-Visible Spectrophotometer
    This article introduces the method of measuring the transmittance of resin solutions using a UV-Vis spectrophotometer.
    Colorimeter evaluation of color difference in anodized coloring layers
    This article explains how colorimeters are used to evaluate color differences in anodized coloring layers. It describes how colorimeters convert colors into numerical values based on international standards and quantify color variations by calculating the color difference ΔE.
    Determination of free amino acid content in protein solutions using a microtitration apparatus.
    This article introduces a method for determining the free amino acid content in protein solutions using a microtiter plate reader. It is based on the ninhydrin color reaction, where amino acids react with the reagent under specific conditions to produce colored compounds, and the concentration is calculated by measuring the absorbance.
    Operating Specifications for the Determination of Hexavalent Chromium Content in Wastewater Using Colorimetric Titration Apparatus
    This article introduces the standard operating procedure for determining hexavalent chromium content in wastewater using a colorimetric titrator. The method is based on the reaction between hexavalent chromium and diphenylcarbazide under acidic conditions to form a purplish-red complex, with the titration endpoint determined by monitoring changes in absorbance at a wavelength of 540 nanometers.
    Wavelength selection for the determination of sulfate content in water quality using photometric titrator
    This article discusses how to select the wavelength when using a photometric titrator to determine the sulfate content in water. The core issue lies in the fact that wavelength selection directly affects the accuracy and anti-interference capability of the detection.
    UV-Vis Spectrophotometer Measures Ink Pigment Concentration
    This article introduces the method of measuring the concentration of ink pigments using a UV-Vis spectrophotometer. The principle is based on the Lambert-Beer law, which calculates the concentration by measuring the absorbance of the pigment solution at specific wavelengths.
    The role of spectrophotometers in ink color matching
    The spectrophotometer objectively quantifies color by measuring the spectral data of ink. Based on the Lambert-Beer law, it converts color into calculable spectral values, replacing traditional methods that rely on the human eye and experience.
    Application of UV Spectrophotometer in the Determination of Lignin in Pulp
    This article introduces the application of ultraviolet spectrophotometry in determining the lignin content in pulp. Lignin is a key component affecting pulp quality. This method utilizes the characteristic absorption of lignin under ultraviolet light for measurement, offering simple and rapid operation.
    Determination of Chromaticity Value of Pulp by Spectrophotometry
    This article introduces the method for determining pulp chromaticity using spectrophotometry. It first explains the importance of chromaticity for pulp quality, then details the basic principles of spectrophotometry, which quantifies color by measuring the reflection of light from the pulp, typically expressed using the CIELAB color system.
    Difference between dual-beam and array spectrophotometers
    This article aims to systematically elucidate the core differences between double-beam and array-type spectrophotometers in terms of working principles, optical structures, performance characteristics, and applicable scenarios, providing clear technical references for professionals in related fields.