The extraction of pure indigo pigment from Indigofera tinctoria leaves is a process that can take up to three days, involving careful fermentation and oxidation. This slow, deliberate method is essential for isolating the potent blue colourant, indigotin, from its precursor, indican.
Unlike many rapid chemical syntheses, the traditional approach respects the plant’s natural chemistry. Fresh leaves are steeped in water, allowing anaerobic bacteria to break down the indican — a glycoside — into indoxyl.
This indoxyl, initially colourless, then reacts with oxygen upon exposure to air, polymerising into the insoluble blue pigment. The timing and pH levels during this crucial oxidation phase are meticulously controlled to maximise yield and purity.
Most commercial hair dyes rely on synthetic colourants, often requiring aggressive chemical developers to penetrate the hair shaft. Evera, conversely, harnesses the natural affinity of plant pigments like indigofera, which gently adhere to the hair’s surface, building colour over time.
This layered approach ensures a more nuanced, less damaging colour application. The resulting hue is not a flat, uniform shade but a rich, complex blue that interacts beautifully with natural hair tones.
The careful control of the fermentation process helps preserve beneficial compounds present in the plant matter. These include polysaccharides and flavonoids, which contribute to the overall conditioning properties of the indigo dye.
After the pigment has precipitated, it is collected, dried, and ground into a fine powder. This powder is then ready for use, requiring only water to reactivate its colouring potential, without the need for harsh peroxides.
The slow nature of indigo dyeing is not a drawback but a testament to its efficacy and gentleness. It respects the integrity of the hair, imparting colour without compromising the cuticle’s lamellar structure.
The deep, cool tones achieved with Indigofera tinctoria are particularly valued for neutralising warm undertones or enriching darker hair. It offers a sophisticated alternative to synthetic blues, which can often appear artificial.
This ancient pigment, patiently coaxed from nature, continues to offer a unique and respectful way to colour hair.
