In this study, the infl uence of the addition of classical pigment, phosphorescent pigment and microcapsules of thermochromic dye on the photocolouration as well as on physical-mechanical properties of cotton fabric printed with microcapsules of photochromic dye was studied. Seven printing pastes of diff erent compositions were prepared. Printing pastes were applied onto 100% cotton fabric using a fl at screen printing technique. The thickness, mass per unit area, stiff ness, tear strength and elongation, and air permeability of printed samples were measured, whilst colour and colour fastness to rubbing, washing and light were spectrophotometrically evaluated. The thickness, mass per unit area, stiff ness and tear strength and elongation of printed fabric increased, whilst air permeability decreased by at least a third in comparison with unprinted fabric. The addition of classical pigment, phosphorescent pigment or microcapsules of thermochromic dye into printing paste that already includes microcapsules of photochromic dye decreases the photocolouration of printed fabric, among which classical pigment has the smallest and microcapsules of thermochromic dye has the largest impact. Photocolouration of fabric decreases with increasing numbers of rubbing cycles; the addition of classical pigment has the smallest and the addition of microcapsules of thermochromic dye has the largest infl uence. The colour fastness to washing of printed fabric was decreased by increases in the number of washing cycles. The addition of any pigment into printing paste that already contains microcapsules of photochromic dye impairs its colour fastness to washing. By lengthening the time of exposure of printed fabric to the Xenotest apparatus, a reduction of colour fastness to light of printed fabric is produced. The addition of classical pigment, phosphorescent pigment or microcapsules of thermochromic dye into printing paste that already contains microcapsules of photochromic dye slightly slows down the reduction of colour fastness to light exposure of fabric printed with microcapsules of photochromic dye. Keywords: photocolouration, microencapsulated photochromic dye, cotton, fl at screen print Izvleček V raziskavi je proučevan vpliv dodatka klasičnega pigmenta, fosforescenčnega pigmenta in mikrokapsuliranega termokromnega barvila na fotoobarvanje in fi zikalno-mehanske lastnosti bombažne tkanine, potiskane z mikrokapsulami fotokromnega barvila. Pripravljenih je bilo sedem tiskarskih past različnih sestav. Tiskarske paste so bile nanesene na 100-odstotno bombažno tkanino s tehniko ploskega fi lmskega tiska. Potiskanim vzorcem so bili izmerjeni debelina, ploščinska masa, togost, pretržna sila in raztezek, zračna prepustnost, barva in barvne obstojnosti pri drgnjenju, pranju in na svetlobi. Slednji sta bili spektrofotometrično ovrednoteni. Potiskanim tkaninam so se povečali debelina, ploščinska masa, togost, pretržna sila in pretržni raztezek, medtem ko se je zračna prepustnost v primerjavi z nepotiskano tkanino za več kot tretjino zmanj...
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