The longer the light stays the deeper the stain.
Light becomes color. The present tense solidifies, like speech written down.
The lighter the blue stains the deeper the fold.
The creases are masks that stencil the sun.
The longer the light stains the richer the blue.
Light stains, as in, it creates an irrevocable change. A before and after.
The longer the blue stays the deeper the stain.
The color may fade in darkness. To make the blue return, place it back in the light.