Simultaneous Synthesis of Silver Nanoparticles and Natural Indigo Dyeing of Wool Fiber

Chromatic and medicinal properties of six natural textile dyes: A review of eucalyptus, weld, madder, annatto, indigo and woad

“…The color also varies depending on the treatment. In the study conducted by Barani [ 65 ], indigo-dyed wool samples without any silver treatment presented a blue shade. Moreover, the undyed-samples had a pale yellow and brown-yellowish shades with silver simultaneous treatment and silver pre-treatment, respectively.…”

“…Pre-treatment with AgNPs also influenced K/S of dyed fabrics. Indigo-dyed wool samples without silver treatment presented lower K/S values at all visible wavelengths compared with the silver-treated indigo-dyed samples [ 65 ]. In other study, silk fabrics and silk-polyester-lyocell blends dyed with indigo and pre-treated with hydrochloric acid showed good fastness to lighting and washing.…”

“…Additionally, simultaneous silver treatment during indigo dyeing process improved the light fastness (from 6 to 7 to 7–8 on the blue scale) and maintained the wash fastness (4–5 on the gray scale) of dyed fabrics compared to pre-treatment with silver. In these processes, sodium dithionite was used as the reducing agent [ 65 ].…”

“…The dyed samples displayed antibacterial activity and UV protection, but poor antioxidant activity. [ 65 ] Barani, 2020 AgNPs were synthesized through two methods: silver pretreatment and simultaneous silver treatment during indigo dyeing. Indigo-dyed wool samples without any silver treatment had a blue shade, the silver simultaneous and pre-treated undyed-wool samples had a pale yellow and brown-yellowish shade, AgNPs on the wool fibers surface had brown-yellowish shade, AgNPs pre-treatment resulted in a dark blue shade and low brightness, and simultaneous AgNPs treatment resulted in a blue shade.…”