Why I went looking

"What dyes do you use on your clothes?" It's a question more of our customers are starting to ask. Have you ever thought about the colour of your clothes, and where it comes from?

Like most activewear brands, ZONE uses synthetic dyes. Our fabrics are OEKO-TEX Standard 100 certified, which means they've been independently tested for harmful substances and come in under strict limits.

But here's the truth. Certified still means synthetic. The chemicals are kept under strict limits, but they're still there. And for a brand built around natural materials and low tox living, I want to go further than just staying under the line.

I've always been curious about plant dyes. An ancient craft our ancestors used for thousands of years, which has been somewhat forgotten in many parts of the world. My interest kept growing, so I started researching them. I recently went to a plant dye factory in Yiwu, China, to see if plant dyeing is an option for us at ZONE and to understand what's involved.

Every colour used to come from the ground

For almost all of human history, if you wanted colour in your clothes, you got it from nature. Roots, leaves, bark, berries, flowers and nut husks.

The oldest known dyed fabric in the world is a scrap of cotton found at Huaca Prieta on the north coast of Peru, striped with plant-based indigo more than 6,000 years ago. That's around 1,500 years earlier than the oldest indigo-dyed textiles found in Egypt. In China, indigo has been identified on textiles at least 3,000 years old.

And indigo isn't a simple dye. You can't just crush the leaves and get blue. The leaves have to be fermented and exposed to air before the colour appears. People were carrying that knowledge thousands of years before anyone had a word for chemistry.

More than colour

Many of the plants used for dyeing were valued for more than their colour. Indigo and madder, two of the oldest dye plants in the world, have long histories in traditional medicine, and modern research is starting to look at why.

A 2023 scientific review of six natural textile dyes, including indigo, madder and weld, found reports of antibacterial activity and UV protection in fabrics dyed with them. Indigo-dyed fabrics showed some of the strongest antibacterial results of the dyes studied, and madder was linked with antibacterial and antioxidant properties.

To be clear, most of this research has been done in labs on small fabric samples, and these effects reduce with washing. So we're not claiming plant-dyed clothing will heal you. But it's a beautiful reminder that these plants were chosen for a reason, and that our ancestors understood them far better than we often give them credit for.

1856: the accident that changed everything

In 1856, an 18-year-old chemistry student in London named William Perkin was trying to make quinine, a treatment for malaria, from coal tar. He failed. What he made instead was a purple that dyed silk beautifully. He called it mauveine, and it was the world's first synthetic dye.

From there, the lab came for the plants. Synthetic alizarin, the colour found in madder root, was on the market by 1869. In 1897 the German chemical company BASF released synthetic indigo. India's indigo industry, which had supplied the world for centuries, went into steep decline. By 1914, Germany was producing 90 percent of the world's dyes.

Synthetic dyes won because they were cheaper, brighter, more consistent and far easier to scale. They still are. Today only a small fraction of the textiles traded around the world are coloured with natural dyes.

Where synthetic dyes sit today

Chances are almost everything you're wearing right now was coloured with synthetic dye. For brands, they deliver exactly what the industry wants: the same shade every batch, in any colour, including the deep blacks and navies that dominate activewear.

That's why certifications like OEKO-TEX Standard 100 exist. Every component of a certified product is tested against a long list of harmful substances, with limit values that in many cases go beyond what the law requires. It's a genuinely useful standard, and it's why we use it.

Inside the plant dye factory in Yiwu

Walking in, the first thing I saw was the raw materials. Roots, leaves, nuts and skins. The kind of things you'd walk past on a bush track without a second thought, and every one of them capable of producing a gorgeous, vibrant colour.

Then I started opening the buckets to look at the colours and how vibrant they were. And what surprised me most wasn't the colour at all. It was the smell.

It was beautiful. Natural. Nothing chemical jumping out of the vats at you. I don't know why it surprised me as much as it did, but it was a really pleasant surprise.

I followed the whole process through, from raw plant to dyed fabric. This is how it works.

The honest trade-off: why we're starting with pastels

Here's the part I didn't expect. The factory told me straight: they can't reliably achieve really dark shades with plant dyes. They can get there, but they can't guarantee the colour fastness. Deep colours need so much more plant material and time in the dye that the colour is much harder to lock in.

So we're starting our plant dye journey with fastness-guaranteed colours. Our first plant-dyed range is a summer collection in soft pastels, and I'm so excited to be going down this path. It's honest to what the plants can do right now, and I'd rather start with colours we can stand behind than push for a black that fades.

A fastness rating of 4 is a strong result for plant dyes. A 5 would mean no fading at all, so expect a minor fade over time, the way natural colour gently softens with wear. These colours are made to last, not just to look good on day one.

Questions you might have

What happens next

Production has started, and our fabric is being dyed right now! We'll reveal which styles are coming very soon. It's a slower, more limited way to make colour, and it means letting the plants set some of the rules. But standing in that factory, opening buckets of dye that smelled like plants instead of a lab, it felt like the right direction for a premium, sustainable brand that says it puts people and the planet first.

Stay tuned. I can't wait to show you what's coming.