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Discover Ludwig"look blue" is a correct and usable phrase in written English.
It is often used to describe someone's appearance or mood. Example: "Sarah's face started to look blue as she struggled to catch her breath after running for so long." In this sentence, "look blue" is used to indicate that Sarah's face has turned a shade of blue due to her exertion from running.
Exact(58)
But in a case where I also believe that I have recently taken a drug that makes blue things look red and red things look blue, the appearance of a red-looking thing before me is reason for me to believe that there is a blue, not a red, thing before me.
The Look: Blue Note.
So why does it look blue?
But her lips look blue, and she won't be reasonable.
Your hair doesn't look blue to us, Mr. Price.
A photograph of a stainless steel water fountain makes it look blue against an orange wall.
The Look: Blue with a view — a knit dress in classic navy with jewels that outshine the shoes is tops.
His stage look — blue satin shirt, bobbed hair, aviator shades — was part New York Dolls glam and part Petula Clark.
"The sky would look blue if you were on the surface and looked at the sun," said Spencer.
Similar(2)
The Look: Blue-eyed Speedracer.
The world's oceans look blue-green because of the phytoplankton.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com