The textile changes its color from white to sunset red or sunrise purple. This color change is intensified by direct sunlight e.g. in contrast to shade.
The color change is to make the invisible visible, since humans can neither see nor feel UV radiation. Thereby the consciousness is to be sharpened and the contact with the sun is to be improved on a long-term basis. Because even though the sun is important for us, it also poses a danger to our skin, especially due to the increasing climate change.