An investigation on the colours obtained from roselle (Hibiscus sabdariffa L.) and their colour fastnesses in woollen carpet yarns

Abstract

In this study, dyeing methods with and without mordant were used for the dyeing of woollen yarn with roselle's (Hibiscus sabdariffa L.) calyx and petals,. As mordants: alum of aluminium, alum of chrome, copper-sulphate, iron-sulphate, potassium-bichromate, potassium-hydroxide, 9sodium-chloride, sodium-hydroxide, sodium-sulphate, sodium-sulphite, tannin, tiny-chloride, and zinc-chloride were used. A total of. 28 dyeing treatments were performed, and very different colours and their tons were obtained. As a result, a variety of colours and their tons can be obtained from roselle's calyx and petals and the plant can provide a wide colour catalogue, indicating that it could be used in vegetal dyeings.