Indicates something is not entirely blue but has a tinge of blue to it.

Slight Blue Touch

Used when blue is not the dominant color, but rather a subtle element.

Not Pure Blue

Sometimes used metaphorically to describe a mood or feeling, not just color.

Describing Mood

 Structures in their cell membrane could harness the energy from sunlight to turn carbon dioxide and water into oxygen gas and sugars, which they could use for energy. Those organisms were the ancestors of what we now call cyanobacteria. Their bluish color comes from the blue-green pigments that capture the sunlight they need.

How a single-celled...

 but this is another mapping of minerals in a different region of Mars Mars phallus that bluish whitish layer that you see is in fact a paleo soil an ancient soil formed on the surface of Mars by water interacting near the surface this one's a little bit easier to understand it looks for all the world

Bethany Ehlmann:...

 The one on the right comes from a yellow surface, in shadow, oriented facing the left, viewed through a pinkish medium. The one on the left comes from an orange surface, under direct light, facing to the right, viewed through sort of a bluish medium. Completely different meanings,

Optical illusions show...

 which is, what happens when galaxy clusters collide? Here is an image. Since galaxy clusters are representative slices of the universe, scaled-down versions. They are mostly made up of dark matter, and that's what you see in this bluish purple. The red represents the hot gas,

What we can learn from...

Henry Lin: What we can...

 to resonate with me and while we may be cultures apart their story was a shared story it wasn't just a story about a revolution but it was a story of a generation and these are the youth who brought it to life shouting slogans in Tahrir Square or hunched over the bluish

Giving a voice to young...

 that might possibly have life. And finally, another iconic backlit image. This image was taken when Cassini was in Saturn's shadow. This doesn't happen very often in the mission. When we took this mosaic, that bluish ring

Life Beyond Earth, Part...

 if you were in a tight fix. The landscape shows the presence of water directly in view, or evidence of water in a bluish distance, indications of animal or bird life as well as diverse greenery

A Darwinian theory of...

 After rain, everything becomes bluish. In the sunny evening, everything is red. It's something that is difficult to explain. It's what we call the soul of a building.

The genius behind some...

 the Oriole still there it will not fly away as we focus on it yeah very nice bright yellow juxtaposed with the bluish hue behind it and that is the

Bluish

Slight Blue Touch

Not Pure Blue

Describing Mood

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