Browsing by Author "Allca Salas, Shirly Coraima"

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    Impact of Natural Dyes Cochineal (Dactylopius coccus) and airampo (Opuntia soehrensii) on the Physico-Mechanical Properties and Colorfastness of Alpaca (Vicugna pacos) Yarns
    (Journal of Natural Fibers of Taylor & Francis, 2026-03-12) Quispe-Quispe, Arturo; Lozano, Franklin; Pérez Falcón, Luis Fernando; Vilcanqui Pérez, Fulgencio; Chaquilla Quilca, Guadalupe; Sarmiento Casavilca, Víctor Hugo; Fernández Ayma, Alfredo; Nuñez Fernandez, Anderson; Allca Salas, Shirly Coraima
    The effect of dyeing with natural colorants on the physico-mechanical properties, colorimetric parameters, hydrophobicity, and color fastness of alpaca threads (Vicugna pacos) was investigated. Two dyes from the Andes were evaluated: cochineal (Dactylopius coccus) and airampo (Opuntia soehrensii), using a post-mordanting method with sodium sulfate (Na2SO4), oxalic acid (C2H2O4), and potassium alum (KAl(SO4)2·12 H2O). The analysis of the results showed that the dyeing treatments did not significantly affect the elongation (51–65%), maximum strength (1.64–1.94 N), or tenacity (0.93–1.10 MPa) of the threads. Regarding colorimetry, cochineal produced intense red shades (a* = 34.95) and the highest saturation (C*) of up to 40.29. Meanwhile, airampo generated warm, bright yellow tones (L*) up to 70.19. A critical finding was the low wash fastness, with ratings of 1 to 2 on the grayscale. However, the rub fastness ranged from moderate to good (2 to 4–5). Dyeing with pure cochineal increased the hydrophobicity of the thread, reaching a contact angle of 97.22°. These results indicate that, although the dyes offer a rich color range without compromising the fiber, it is essential to optimize the process to improve color fixation before commercialization.