Synthetic Dyes are Designed to be Recalcitrant, With Most Being Non-Biodegradable

As the textile-apparel-fashion industry oscillates from greenwashing to greenhushing and greenblushing, a critical component of the backend is the dye. While it is becoming increasingly critical for manufacturers to shift to natural dyes, what also needs to be done is make them as popular as their synthetic counterparts and educate the customer about their basic goodness, mechanise dyeing and grow more raw materials so as to reduce the cost of the dyed product.

Long Story, Cut Short
  • Textile industry effluent is a notch below the most difficult effluents to treat.
  • Artisans, mostly in villages, dye locally, to obtain the required shades. Shifting them to parks or getting them to use mill dyed yarn would make them lose their identity and succumb to competition by the mechanised sector.
  • Unlike other natural dyers who offer certain fixed colours, BioDye can give a colour the designer desires.
The late Ann Shankar, a keen student of textile history, visited libraries in Mumbai, Kolkata and Delhi and in England to compile a list of over 500 plants that had been recorded by the British botanists, whose parts were used as textile dyes. During this study, she was aghast to learn that her direct ancestor, the first Governor-General of India, had ordered this study in order to transfer the intellectual property of Indian dyers to England. She used her inheritance to support BioDye when it was started.
A wrong righted The late Ann Shankar, a keen student of textile history, visited libraries in Mumbai, Kolkata and Delhi and in England to compile a list of over 500 plants that had been recorded by the British botanists, whose parts were used as textile dyes. During this study, she was aghast to learn that her direct ancestor, the first Governor-General of India, had ordered this study in order to transfer the intellectual property of Indian dyers to England. She used her inheritance to support BioDye India Pvt Ltd in its formative stage. BioDye India Pvt Ltd

For their first project, Ann and Co-Founder Dr Bosco MA Henriques worked with Blatter Herbarium of St Xavier’s College, Mumbai whose director had studied the flora in Western Ghats around Amboli in Sawantwadi taluka. Over 300 plants recorded by Ann were found in this region. Most important, they knew the location of the plants and this enabled them to quickly collect over 200 specimens and identify more than 100 of them as sustainable sources of dyes. The dye house was set up at the base of the Ghat as Mumbai and Goa were easily reachable.

The late Ann Shankar, a keen student of textile history, visited libraries in Mumbai, Kolkata and Delhi and in England to compile a list of over 500 plants that had been recorded by the British botanists, whose parts were used as textile dyes. During this study, she was aghast to learn that her direct ancestor, the first Governor-General of India, had ordered this study in order to transfer the intellectual property of Indian dyers to England. She used her inheritance to support BioDye India Pvt Ltd in its formative stage. 

BioDye India Pvt Ltd today dyes all yarn, fabrics and apparel made from natural fibres supplied by its principals or clients who then weave the yarn into fabric, rugs and tapestries, and convert the fabric into apparel, home furnishings and accessories.

It uses natural indigo for blue, bottle greens and purples; regenerative vines of Indian or Naga madder for red and oranges; lac for red/pink and purples, cutch and tea dust for brown, iron vinegar for black, grey, olive green and violet; leaves from 3-4 plants for yellow, earth hues, orange and bottle green.

This is the second and final part of an interview with Bosco Henriques. The first part appeared yesterday (17 April 2023).

Your website quotes ancient texts. What were the modern interventions that you adopted?
Earlier investigators used chemical principles to make improvements to natural dyeing processes. Natural dyes are biochemical entities. Hence, I approached the problem from a biochemical perspective to understand the ancient methods and accordingly make improvements. I thus succeeded in speeding up the process and getting colours which are fast on the different substrates.

Tell us about the different fabrics, specially the fabrics from Nagaland. How did you come to work with them? How long does it take to create the green fabrics in Nagaland?
Naga weavers use the loin loom (back strap loom) to weave fabrics for their use and such a loom was commonly used by all tribes in Northeast India. While the tribes in the other states have, by and large, switched over to using flying shuttle frame looms, the Nagas, proud of their tradition, continue to use the loin loom. The production is slow; however, the designs obtainable on a loin loom cannot be normally woven on a shuttle loom. 

I am now associated with Nila House (Lady Bamford Foundation), and with them continuing working with farmers and the loin loom weavers. I also enable the villagers to grow their indigenous perennial cotton trees, and to develop tools to convert it into yarn which they can then use to weave their loin-loom fabrics. This will take time since the cultivation of the plants has to be integrated with their traditional jhum practices, and appropriate small machines need to be developed to gin the seed cotton and convert it into rovings. The villagers also need to be trained in their use. 

At present the Nagas use acrylic to weave their products. I am working with groups to reintroduce cotton spinning, dyeing and loin loom weaving. It will take a few years to have sufficient amounts of tree cotton and natural dye plants to ensure the production of a 100% green fabric. This project is now being implemented by the North East Initiative Development Agency (NEIDA), a Tata Trusts supported nonprofit, and funded by Lady Bamford Foundation.

How much time does it take to dye, say 100 metres?
It depends on the gsm of the fabric and shade. We can dye approximately 300 – 500 kg a month.

Which are the companies, designers, brands who use your products/fabrics?
We are a low volume, high value business. Unlike other natural dyers who offer certain fixed colours, we can give a colour the designer desires. In this way the creativity of the designer is not constrained. We work with a few clients such as Industry of All Nations, USA; Seek Collective, USA; Bailey Renee, USA; Maiwa, Canada, Botanica Tinctoria, Canada; Oyyo, Sweden; Kardo, New Delhi, Nila House, Jaipur, Khatkata Weavers, Maheshwar; Kumbaya, MP; Amba, Mumbai. The Indian clients export finished goods to foreign buyers.

Why and how did you pick the site for your company? How many people work with you from the gathering of the herbs and branches to the processing to get the dyes and fabrics? Has working for your company changed their lives in any way?
We set up our dye-house in Sawantwadi because in an UNDP-funded project we had identified over 100 dye-yielding plants present in the area. We were then following the old paradigm that you needed different plants to obtain different colours. However, when we learned to blend natural dyes to obtain the desired shade we found we needed only a few plants for our palette of colours. These shrubs are grown by our workers on their property. 

They collect the leaves, dry them and bring them over. Setting up an industry in a rural area is difficult. Power failures and internet shutdowns are very frequent. We need to go to the town to buy our inputs, collect and dispatch shipments. Absenteeism is common. All this adds to the expense of doing business. A steady job in the rural setting definitely has made a positive contribution to the lives of our workers. For example, the wives of our workers do not have to collect firewood; they can afford to cook on gas and the workers come to work on their own vehicles. 

Most of our clients weave on handlooms and it is prohibitively expensive to get the handloom weaver in the certification loop. Hence, we do not go in for certification. We encourage our clients to see the process themselves and self-certify. Most of them hire professional photographers to document our operations and record our story which is presented to their clients.

Dr Bosco MA Henriques
Co- Founder & Director
BioDye India Pvt Ltd
Dr Bosco MA Henriques

Have you been able to quantify the carbon footprint of your products vis-à-vis the conventional ones? Do elaborate.
We presently use firewood from trees that are coppiced. However, by the end of the year we will shift to using solar energy, and when it is unusable, switch to electric energy, to pre-heat water. We will employ efficient LPG burners to maintain dye bath temperature. We will also use insulated water storage tanks and dyeing vessels to cut down on energy wastage.

What is the turnover of the company? What has been the growth story and what are the projections for the next 2 years
Our turnover since you last spoke to me some five years back continues to be around one crore. We are not limited by demand, but by indoor drying space. Our dyed fabric is by and large exported and so the economic situation in North America and Europe will determine our growth this year. 

Please share info of the geographical area where you are located, the availability of raw materials, the forests from where you source the raw materials, and steps taken to rejuvenate the areas.
We are currently located in Madkhol, a village at the foot of the Western Ghats. The extended rains in the past couple of years necessitates that we dry indoors for many months of the year (end-May to mid-November). This adds to our cost and limits our growth. However, our new location at Vilholi in North Western Maharashtra in Nashik district, where we will move before this monsoon, will ensure that these restrictions do not hamper our growth. All our male workers are coming with us. Non-dyeing operations will continue at Bebiwadi. 

BioDye India Pvt Ltd
Dyeing Naturally BioDye India today dyes all yarn, fabrics and apparel made from natural fibres supplied by its principals or clients who then weave the yarn into fabric, rugs and tapestries, and convert the fabric into apparel, home furnishings and accessories. BioDye India Pvt Ltd

How polluting are synthetic dyes? What is needed to make natural dyes as popular as their synthetic counterparts?
Synthetic dyes are designed to be recalcitrant. Nearly all of them are non-biodegradable. Many could be allergenic and toxic if tested. The synthetic auxiliaries used are non-biodegradable and often toxic. Hence the sludge from a synthetic dye manufacturing factory and synthetic dye-house are classified as hazardous and have to be disposed of in lined pits.

Different solutions are needed for the small scale dyer and large dye-houses. Solutions presently available will require discipline by the dyers to separate the biodegradable (soap and detergents) streams, the non-biodegradable streams (dyes and most auxiliaries) and the rinse water streams.
Biodegradable streams can be treated in anaerobic chambers and disposed of in soak pits, whereas the non-biodegradable streams need proper treatment. Treating the non-biodegradable streams using easy to use, low-tech methods is challenging. 

If precipitation, absorption or oxidation methods are employed, bulky sludge is produced which needs to be properly dried and disposed of, either by burial in sites that accept hazardous waste or in high temperature incinerators (the ash has to be buried). Reverse osmosis is technically too challenging to operate at the artisan level (even here solid waste needs to be properly disposed of). The temptation to improperly bury the sludge or dispose it off for other use (concrete) has to be resisted.

Textile industry effluent is a notch below the most difficult effluents to treat. It can be done if sufficient capital is available to install the complete treatment plant and if margins are available to absorb the operating costs. Besides being capital and operationally expensive, it is also energy intensive and technically demanding to operate. The concentrated effluents are very corrosive and the equipment has to be made from titanium or an expensive moly-steel. The treatment process converts polluting liquid into solid pollutants (that have to be buried in secure waterproof lined landfills) or gaseous pollutants (carbon dioxide, NOx andSOx); the first would add to global warming and the latter two would need to be scrubbed out from the flue gases. As the market for fast fashion is changing, dye houses are cautious to make such large new investments.

Artisans are located in villages that are scattered across the country. They dye locally, to obtain shades that maintain their product identity, hence shifting them to parks or getting them to use mill dyed yarn would make them lose their identity and succumb to competition by the mechanised sector.

To make natural dyes as popular as their synthetic counterparts, we need to educate the customer (which most of our foreign clients do), mechanise dyeing and grow more raw materials so as to reduce the cost of dyed product.

Richa Bansal

RICHA BANSAL has more than 30 years of media industry experience, of which the last 20 years have been with leading fashion magazines in both B2B and B2C domains. Her areas of interest are traditional textiles and fabrics, retail operations, case studies, branding stories, and interview-driven features.

 
 
 
  • Dated posted: 18 April 2023
  • Last modified: 18 April 2023