engleski

Analysis of natural dyes color characteristics – subjective vs. objective

A study has been performed in order to analyze the nature of specific appearance characteristics of dyes obtained with natural dyes, given the still insufficiently investigated characteristic discrepancy between visual perception of color obtained with natural dyes versus their objectively defined spectral characteristics. As a source of dye following raw material have been used: pomegranate peel (chromophore: punicalagin and punicalin), onion peel (chromophore: quercetin), green walnut shells and young walnut leaves (chromophore: juglon), Aleppo pine, chamomile, ash, mint and madder. Pre-treatment of the material was performed with metal salts (wetting agents): potassium aluminum sulfate dodecahydrate, copper(II) sulfate pentahydrate and iron(II) sulfate heptahydrate. Wool, silk, polyamide PA and cotton fabric samples non-treated and pretreated with metal salts were dyed with natural pigments listed above. After the dyeing, a colorimetric study based on objective spectrophotometric measurement was performed. An evaluation of the color parameters of each sample was performed (L *, a *, b *, C *, h). Based on objective and subjective analysis of color hue, an analysis of specific differences between subjective perception and objective measurement in the area of specific chromatic- achromatic shades obtained by natural pigments, has been carried out. In addition, an analysis of the color strength regarding the different types of fabric samples as well as different types of mordanting was performed.

dyes, metal salts, visual experience, spectrophotometric analysis

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