engleski

Linen fabric dyed with flavonoid compounds extracted from waste onion skin

The dyeing of linen fabric with natural dye was carried out with flavonoid compounds extracted from onion skin. For this research linen fabric pre- bleaching with hydrogen peroxide, as well as pre- treatment with metallic salts (mordants) on the resulting colouration were studied. Results are presented through the analysis of spectral colour properties (hue (h), chromaticity (C*) and lightness (L*)). Extracted flavonoid derivative has a relatively low substantivity to cellulosic material, therefore the mordant pre-treatment is necessary. Pretreatment of the linen fabric with metal salts and dyeing process resulted in a wide range of colour hues: greyish (without mordant), yellow-brown (Al), red-brown (Cu) to dark brown (Fe). The values of the all colour hue are in the yellow - orange area (h = 66.62 - 81.84). The bleached fabrics retain approximately the hue value, the chromaticity increases relative to the raw samples, but an increase in the brightness value indicates that the samples obtained more vivid colours. This research contributes to the revitalization of flax fibre, to the use of flavonoids for the dyeing of cellulosic materials and to the use of bio waste as a source of dyes.

linen fabric, natural dyes, onion skin, flavonoid compounds

nije evidentirano