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Sunday, 22 September 2019
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Raw materials & technologies, Raw materials, Coatings pigments

Coatings pigments: Surface texture effects colour appearance of metallic coatings

Friday, 1 August 2014

In a study, the effect of aluminium flake size on the colour appearance of metallic coatings has been investigated.

Scientists analysed the effect of aluminium flake size on the colour appearance of metallic coatings Source: ROMA - Fotolia.com

Scientists analysed the effect of aluminium flake size on the colour appearance of metallic coatings Source: ROMA - Fotolia.com

To this end, metallic solvent-borne basecoat-clear coat systems with seven different surface textures using different sizes of aluminium flakes were prepared corresponding to nine colour centres including blue, yellow, red, green, purple, cyan, orange, greenish yellow and grey.

Finding the best texture analysis method

The colour changes via texture differences were assessed by visual experiments carried out by 25 observers including 14 women and 11 men using grey scale method and under semi-diffuse illumination conditions. The assessed pairs had the same colour centre and different visual texture caused by different aluminium flake sizes. Texture analysis was performed using autocorrelation function and fractal dimension on grey scale images of the samples, captured by a scanner, and texture difference for each assessed pair was computed. The results showed that different aluminium flake size can cause different visual texture and consequently different colour appearance. The correlation between perceptual colour differences and the texture differences showed that autocorrelation function and fractal dimension have a pretty good performance for quantifying texture feature of the metallic coatings while the texture is caused by aluminium flakes.

The study is published in: Progress in Organic Coatings, Volume 77, Issue 7, July 2014, Pages 1221-1225.

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