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The aim of the research was to examine the infl uence of the antimicrobial sol-gel fi nishing based on dimethyl-tetradecil-[3(trimethoxysilyl)propyl] ammonium chloride (Si-QAC ) on the colour and colour fastness of cotton (CO), silk (SE) and wool (WO) fabrics, which are mostly used in the conservation-restoration of historic textiles. The fabric CO was dyed with direct and reactive dyes, and with indigo, the fabric SE was dyed with the metal complex dyes and the fabric WO with the acid dyes. Yellow, red and blue colours were used. The Si-QAC agent was applied in two increasing concentrations. The dyed non-fi nished and fi nished samples of fabrics CO, SE and WO were artifi cially illuminated in Xenotest, and repeatedly washed in Launder-Ometer. Colour diff erences were determined between illuminated and non-illuminated as well as washed and non-washed samples and consequently statistically evaluated with the multifactor analysis of variance, ANOVA. The results show that the presence of the coating resulted in the colour change of all studied samples. The coating presence signifi cantly impaired the lightfastness of dyeings, but did not signifi cantly aff ect the washing fastness of dyeings. Colour fastness was importantly infl uenced by the dye structure.

Infl uence of Antimicrobial Finishing on Colour and Colour Fastness of Textiles from Natural Fibres