Abstract
Natural dyes have been used since long back in various areas such as textiles, craftwork, food colouring and also as medicine. This work was based on expansion of the colour shade that can be obtained from natural dyes for use by the small scale users. The natural dye was extracted from three naturally available plants locally in Zimbabwe using the cold extraction under gravity method. An alcohol was used to extract the dye using a vacuum pump and left to dry.
Highlights
Humans have used natural dyes for colouration thousands of years before 10,000 BC with the oldest examples being prehistoric cave paintings, which show the already-sophisticated use of carefully-graded colours [1]
The dyeing process to textile materials and other craft products was accomplished through use of colours of natural source, up until synthetic colours or dyes were invented and commercialized
Parinari curatellifolia: The fabric readily picks up a reddish colour as soon as it is immersed in the dyebath but later turn turns to a greenish colour and a precipitate when iron chloride (FeCI3) is used to pre-treat the fabric
Summary
Humans have used natural dyes for colouration thousands of years before 10,000 BC with the oldest examples being prehistoric cave paintings, which show the already-sophisticated use of carefully-graded colours [1]. The dyeing process to textile materials and other craft products was accomplished through use of colours of natural source, up until synthetic colours or dyes were invented and commercialized. The sources of these natural colours or dyes include insects, plan leaves, fruits and roots. Colours commonly derived from plants included yellows, largely extracted from weld (Reseda Luteola), and found in other plant species like quercitin and persian berries. Madder (Rubia tinctorum) is known to be the most important source of the red dye alizarin, though some other reds were extracted from insects like cochineal and kermes [2]. The colour black was obtained mainly from logwood, it could be made from mixing dyes of other colours [3]
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