Dyeing silk fabric using anthocyanin pigments extracted in different solvents from Hibiscus sabdariffa L

In this research study, anthocyanin pigments were extracted from Hibiscus sabdariffa L pigment using some solvents including distilled water, citric acid, ethanol and sodium hydroxide. Then the effect of the type of solvent used in the pigment extraction stage on the dye parameters and fastness of the dyed silk fabric was investigated. Pre-mordanting, simultaneous and post-mordanting methods were used for dyeing, and potassium aluminum double sulfate metal salt was used as the mordant. The results showed that although the dyeing process for all the samples was carried out in an acidic environment, the use of different solvents and the change in the pH of the pigment extraction environment caused a change in the created hue, the amount and area of a* and b* and the color strength of the examples. The highest color strength was created in the pre-mordanting method by using the pigment extracted in sodium hydroxide environment, while the lowest one was obtained in the post-mordanting method by applying the pigment extracted in distilled water environment. Also, according to the ISO standard, in the pre-mordanting method, the samples dyed with pigment extracted in sodium hydroxide environment and in the post-mordanting method, all samples had acceptable washing and light fastness.