Article ID Journal Published Year Pages File Type
1230384 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2014 5 Pages PDF
Abstract

•Paint samples of different colour pigments were studied by Raman and VIS spectroscopy.•The pigment identification based on Raman spectrum decreased with its concentration.•The homogeneity of paint samples is an important factor for colour identification.

The aim of the paper was to evaluate the influence of pigment concentration and its distribution in polymer binder on the possibility of colour identification and paint sample comparison. Two sets of paint samples: one containing red and another one green pigment were prepared. Each set consisted of 13 samples differing gradually in the concentration of pigment. To obtain the sets of various colour shades white paint was mixed with the appropriate pigment in the form of a concentrated suspension. After solvents evaporation the samples were examined using spectrometric methods. The resin and main filler were identified by IR method. Colour and white pigments were identified on the base of Raman spectra. Colour of samples were compared based on Vis spectrometry according to colour theory. It was found that samples are homogenous (parameter measuring colour similarity ΔE < 3). The values of ΔE between the neighbouring samples in the set revealed decreasing linear function and between the first and following one – a logarithmic function.

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Related Topics
Physical Sciences and Engineering Chemistry Analytical Chemistry
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