Colour and the Dye Pot

Colour is the first thing most people notice about a rug, and one of the last things they think about in terms of process. Yet every colour in a handmade rug has passed through a dye bath, and the way it was dyed shapes how it looks today and how it will look years from now.

There is a good deal of romance and some confusion around dyes. This is a plain account of the two broad approaches, natural and synthetic, and what each brings.

Natural dyes

Natural dyes are derived from plants, insects and minerals. India has long been associated with dyeing, and some of the best-known natural dyes have strong connections to the subcontinent.

• Indigo gives blues, from the palest sky to deep, almost black navy. The name itself points to India, and indigo has a long history in Indian textiles.
• Madder, a root, gives reds, from soft pinks to deep brick and rust.
• Various plant sources, including certain barks, flowers, leaves and fruit rinds, give yellows, browns and tans.
• Combinations give secondary colours: greens from yellow over indigo, purples from red over blue.

Most natural dyes require a mordant, a substance that helps the dye bind to the fibre. Mordants affect the final colour; the same dye can give quite different shades depending on the mordant used.

Natural dyeing is a skilled craft. Results depend on the quality of the dyestuff, the water, the temperature, the timing and the dyer's experience. The colours tend to be complex, with subtle undertones, and they sit together harmoniously. They also tend to produce more variation between batches, which contributes to abrash in the finished rug.

Natural dyes are sometimes described as more sustainable than synthetic ones. The reality is more nuanced: some mordants and processes have their own environmental considerations, and the cultivation of dye plants requires land and water. We prefer to treat natural dyes as a choice of character and craft, rather than making broad environmental claims for them.

Synthetic dyes

Synthetic dyes emerged in the nineteenth century and transformed textile production worldwide. Early synthetic dyes were uneven in quality, and some faded or ran badly. Modern synthetic dyes for wool are generally very different: stable, consistent and available in an almost unlimited range of colours.

Their advantages are considerable.

• Consistency. Colours can be matched closely between batches, which matters for large rugs, pairs and projects that require repeat orders.
• Range. Any colour a designer can imagine can usually be achieved.
• Fastness. Good-quality synthetic dyes, properly applied, resist fading and bleeding well.

Synthetic dyes still require care. Dye houses should manage their effluent responsibly, and it is right to ask how this is handled.

Neither natural nor synthetic dye is a mark of quality in itself. What matters is how well the dyeing is done.

Why rugs change colour over time

All dyed fibres respond to light. Over years, colours in a rug may soften and mellow, particularly on a side facing a sunny window. This is why rotation matters, and why many older rugs have a gentle, harmonious palette that newer pieces take time to develop.

Some contemporary rugs are washed in ways that intentionally soften their colours from the start, giving a lived-in appearance. This is a finishing choice and should be described as such.

Undyed wool

Some of the quietest and most beautiful rugs use wool in its natural colours: ivory, cream, grey, brown and near-black, depending on the sheep. Undyed wool avoids the dye bath altogether and has its own subtle variation. It is a natural fit for minimal and architectural interiors.

Choosing a palette

When choosing a rug, consider how its colours will behave in your room.

• Look in daylight. Artificial light can shift colours considerably, especially blues, greens and greys.
• Look from both ends. Pile direction affects how colour appears.
• Think about the long term. Softer, complex colours often age more gracefully than bright, flat ones.
• Ask about dyes. A good seller should be able to tell you, at least in general terms, how a rug was dyed.

How we describe dyes

At Carprugs we aim to describe dyes accurately. Where a rug uses natural dyes, we say so; where it uses synthetic dyes, or a combination, we say that too. We do not use "vegetable dyed" as a general marketing phrase. And we recognise that the beauty of a rug's colour lies less in the name of its dye than in the care with which it was chosen and applied.