What color are the red paper flowers in different weather?

It's bright under the blue sky and dark on rainy days.

Salt absorbs water easily. On rainy days, there is enough water vapor in the air, and the salt on the paper flower absorbs more water, so the color of the paper flower becomes darker.

The water vapor content in the air on sunny days is low, so the salt on the paper flowers can't absorb water, and the color naturally becomes lighter.