Opal

is a very unsaturated very light cold bluish cyan

Blue is a cool calming color that shows creativity and intelligence. It is a popular color among large corporations, hospitals and airlines. It is a color of loyalty, strength, wisdom and trust. Blue has a calming effect on the psyche. Blue is the color of the sky and the sea and is often used to represent those images.
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Goes well with complementary color

Quicksand

# C6A6A3

or triadic complementary

Thistle Green

# C3C6A3

and triadic complementary

Lilac

# C6A3C3

To a colorblind person appears

Silver

# b9b9b9