Metamerism, when two identical colours look different

Short answer: Metamerism means that two colours look the same in one light but different in another. Two black socks can look alike indoors and different in daylight. It comes from the make-up of the light and the properties of the dye, not from something going wrong.

What metamerism is

Colour is not only a property of the garment but the result of the garment and the light that hits it. Two fabrics can reflect light differently and still look alike under a particular lamp. If the light changes, the difference can suddenly show. It is a common phenomenon known from many materials.

The light makes the difference

Daylight, incandescent bulbs and LED light each have their own make-up. Under warm indoor light colours can look more yellow, and in cold light they can seem bluish. That is why two identical pieces can look the same at home and different at the office or outside. It is the light that changes, not necessarily the fabric.

How to spot it

Hold the two pieces side by side and look at them in different light. Go to a window, out into daylight and under a lamp. If they look the same in one place and different in another, it is probably metamerism. Take your time, and let your eyes adjust to each light.

Why dyed fabrics can differ

Even identical colours can be mixed from different dyes, or dyed in different batches and on different materials. Yarn and fabric take colour slightly differently. That is why black knit and black cloth can look alike in one light and differ in another. This is normal and not necessarily a flaw.

When you combine clothes

If two pieces are to be worn together, judge them in the light you most often wear them in. See them together in daylight before you decide, especially in black, navy and grey, where small differences are easy to see. Many choose to let the colours sit slightly apart on purpose instead of trying to match exactly.

Pictures and screens

Screens show colours differently, and photos are taken in a particular light. That is why the colour in the picture can differ from what you see at home. Use the picture as guidance, not as a guarantee. If you have a particular colour in mind, compare it in daylight with clothes you already own.

Care and colour

Washing and wear can change how a colour looks over time, and two pieces that are worn differently can end up looking more different. Wash according to the care label, and wash clothes of the same colour together so they age alike. That makes it easier to keep the colours matching.

Use the range as an overview

If you want to compare colours, look at the whole range for men and see how the colours sit next to each other. The bestsellers are a good place to start, and you can see them under bestsellers for men. Socks are easy to compare, and you find them under socks for men and women.

Frequently asked questions

Is metamerism a flaw?

No, it is a natural phenomenon where colours look different in different light. It does not necessarily mean the garment is dyed wrongly.

How do I check whether two pieces match?

Hold them together in daylight and under indoor light. If they look the same in both places, they go well together.

Can I trust the colour in pictures?

Use them as guidance. Screens and light affect colour, so daylight and a comparison with clothes you own give the best picture.

You can find the full range at Copenhagen Bamboo.