Black is finally getting its sustainability moment

From captured pollution to algae waste, a new generation of pigments is rethinking how fashion makes its most ubiquitous colour.

There’s a good chance you’re wearing black right now. Black jeans, black top, black socks. It’s the wardrobe workhorse: the colour that goes with everything, never shows dirt (allegedly), and makes us all look a little more put-together than we actually are.

The thing nobody tells you at the checkout is that black is one of the most environmentally costly colours to produce in fashion. The culprit is a substance called carbon black, the pigment responsible for that deep, rich darkness in most black textiles. Carbon black is a byproduct of burning fossil fuels and its production is energy-intensive, carries health risks if improperly handled, and it locks the textile industry into yet another dependency on non-renewable resources.

What if the answer to black’s environmental cost was hiding in our waste streams all along?

A quick lesson in “dope dyeing” (bear with us)

Conventional fabric dyeing happens late in production: cloth is woven or knit, then submerged in a dye bath. It’s water-intensive and expensive to get wrong.

Dope dyeing takes a different approach: pigment is added directly into the liquid polymer before it’s spun into fibre. Colour is integrated from the start, which means less water, less waste, and consistency that runs through the fibre rather than sitting on its surface.

Carbon black (the conventional fossil-fuel-derived pigment) is already used this way. It’s a well-established part of how man-made fibres like polyester are coloured at scale. So the process itself isn’t new. What’s new is the question whether could we dope dye those same fibres (man-made cellulosic fibres like viscose and lyocell, as well as recycled polyester) using pigments made from waste instead? Same method, completely different starting point.

Black from exhaust fumes, algae, and wood chips

Here’s where it gets genuinely remarkable. The innovators we worked on this problem with aren’t tweaking the edges of an existing system: they’re rethinking where colour comes from in the first place. And the feedstocks they’re working with are about as far from a petrochemical plant as you can get.

Graviky Labs takes carbon emissions captured directly from factory chimneys and industrial air pollution, and turns them into pigment. Let that sink in: the black on your t-shirt could be made from the very pollution that was causing the problem in the first place. Waste, converted into colour, kept out of the atmosphere.

Living Ink works with waste algae, a fast-growing organism that needs no arable land, no pesticides, and very little to thrive. Algae has been producing rich, dark pigments for billions of years. We’re only just catching up to the idea of using it.

Nature Coatings sources its pigment from wood residue left over from timber production, material that would otherwise be burned or discarded. The result is a carbon-rich black that comes not from drilling, but from the forest floor.

What makes all three genuinely exciting isn’t just that they’re innovative: it’s that they invert the logic of the problem entirely. Instead of extracting new resources to create colour, they start with what already exists (pollution, biological waste, industrial offcuts) and find the value in it. That’s not a marginal improvement, but a different way of thinking about what materials are for.

The question we had, of course, is whether these pigments can actually perform.

So, do they actually work? Take a look at it yourself:

The short answer: yes. Across trials in both fibre types, the waste-derived pigments held up. Colour was consistent, it didn’t fade badly, and the fabric didn’t lose its structural integrity. For a first-generation proof of concept, that’s a genuinely meaningful result — it moves the conversation from could this ever work? to here’s what it takes to make it work reliably.

And some of the lessons learned along the way are surprisingly intuitive.

Grind it finer. The biggest technical challenge wasn’t the pigment itself — it was getting the particles small enough and evenly mixed into the polymer. Think of it like baking: if your ingredients aren’t properly combined before they go in, the result is uneven. The same logic applies here, just at a microscopic scale.

The fabric matters as much as the pigment. Thinner, finer yarns showed up colour inconsistencies more readily, while chunkier constructions held the pigment better and produced deeper, more even blacks. It’s a reminder that sustainable innovation rarely lives in one ingredient alone: it’s a system, and every part of that system has to be designed to work together.

Starting at the fibre level is the smart move. These pigments were originally developed for printing: think ink on a surface. Scaling them for colouring entire rolls of fabric through conventional dyeing proved tricky and costly. Building the colour in at the very start of the process, before the fibre even exists, turns out to be both more efficient and more realistic as a path to scale.

The cost question (and why it’s not as simple as it sounds)

Cost is always the moment where sustainable alternatives run into a wall. And it’s worth being honest: biogenic black pigments are not yet price-competitive with conventional carbon black at scale. The economics depend heavily on volume, and volume depends on commercial uptake - the classic chicken-and-egg problem we encounter so often.

But the cost trajectory looks more promising when you factor in where the savings come from. Dope dyeing itself is already more resource-efficient than conventional dyeing: less water, less energy, less waste in the production process. As pigment milling improves and supply chains tighten, the gap narrows further. The most promising scenarios involve producers co-locating near their waste feedstock sources, reducing logistics costs and improving feedstock consistency in one move.

This is how most sustainable material transitions have played out historically: expensive at pilot scale, viable at commercial scale, competitive once infrastructure catches up.

What this means for the black t-shirt you’re (probably) wearing

Fashion has a habit of treating colour as an afterthought (a finishing step, a styling decision, a marketing lever). But colour is chemistry, and the chemistry behind conventional colouration, from dyestuffs to pigments to finishing chemicals, is one of the industry’s most significant and least-discussed environmental liabilities. The work being done on biogenic black pigments is a reminder that even the most mundane choices (the colour of a basic) have supply chains attached to them. And that those supply chains can be redesigned.

Fashion moves slowly when it comes to infrastructure. But it has moved before: recycled polyester went from curiosity to mainstream in less than two decades. Organic cotton, once a niche, now sits on the shelves of every major retailer. The materials we consider normal today were once considered experimental.

Black made from waste could follow the same path. And when it does, the most ordinary thing in your wardrobe will carry an extraordinary story.