Wilderness Wisdom

009 A mountain stream can look painted

Summary
Turquoise water is usually not a color in the water, but an optical effect. Light scattering, reflections, fine suspended particles, depth, the subsoil, and the sky all contribute to the impression.

What's behind it
Very fine mineral particles scatter light in such a way that blue and green appear more prominent. A light-colored subsoil also reflects light back, especially in shallow, clear water. Viewing angle and the sky shift perception, even if the water itself does not change.

When it's noticeable
Especially common with meltwater or after heavy runoff, when fine material is introduced without the water simply appearing brown and murky. Often clearly visible where fast currents transition into calmer pools.

Important
Turquoise does not automatically mean clean. Often it's not chemistry, but physics of light and particles. Brown after rain and turquoise with meltwater are different natural mechanisms. Cameras can intensify the effect, but the effect itself is real.

Observe outdoors
Calm pools, light-colored stones, gravel, and changing daylight often show the color particularly clearly.

Sometimes color is just light.

Where did you last see turquoise-looking water?

#erdnaht

ERDNAHT
Connected to the earth.