The square with a diagonal line in the corner

Short answer: A diagonal line in the top left corner of the square means dry in the shade. It is a warning about sunlight, not about drying outdoors. With a little care, clothes can hang outside and dry without the colour suffering.

What the symbol means

The symbol is a square with a diagonal line in the top left corner, and it belongs to the drying symbols on the care label. It says the item should dry in the shade. So it is not about whether clothes may go outside, but about not lying in direct sun while wet. The shade matters, not the place.

Sunlight costs colour

Direct sun on wet fabric fades colour faster than anything else in an ordinary day. You rarely notice it from one day to the next, but after some weeks you see the difference between parts that saw a lot of sun and parts that stayed covered. It hits dark items hardest, such as bamboo T-shirts for women.

A warning about sun, not air

Fresh air is good for clothes, and nothing speaks against drying outdoors. The label only warns about direct sunlight. A shaded spot with a breeze gives you both: the laundry dries and the colour stays put. A house wall, a fence or a covered balcony can provide that shade.

Why wet fabric is most exposed

Water carries light deeper into the fibres, so the sun works deeper on a wet item than on a dry one. The same time in the sun does more harm right after washing than later in the day, when the laundry is nearly dry. This also applies to bamboo panties in strong colours, which can fade quickly.

Dark and strong colours

Dark and strong colours show fading most clearly, because the gap to the original colour is largest. A black or deeply coloured item looks paler faster if it often dries in the sun. Light colours show it less, but they are affected too. It makes sense to treat everything the same and make shade your standard.

How to dry outdoors anyway

Hang the clothes on the shady side of the house, or dry them in the evening when the sun is low. Turn them inside out too, so the outer surface is not hit directly by the light. That way even a bamboo sweatshirt for women can hang outside without losing colour. Take the laundry in once it is dry.

When you dry indoors

Drying indoors is always safe for the colour, because there is no direct sunlight. The condition is a room with air exchange, so the laundry does not stay damp and start to smell. Open a window for a while, or use a well ventilated room. Place the rack a little away from the wall so air reaches the clothes from all sides.

Making it a habit

It does not have to be complicated. Pick a fixed place in the shade and hang the laundry there every time. If you only have sun, wait until the evening or hang the items inside out. After a few times it happens by itself. It is a small effort compared with what it can mean for how your clothes look.

Frequently asked questions

Does it apply in cloudy weather too

Partly. Clouds soften the light but do not remove the light that fades colour. So choose the shade on grey days as well if you want to protect the colour.

How quickly do you see the difference

On strong colours after three to five sunny days. Other colours show it later, but shade is still the safest choice for anything that should keep its colour.

Is drying indoors always safe

For the colour, yes, but make sure there is air exchange so the laundry does not smell. Open a window or use a ventilated room so it dries quickly.