Sirocco

# 707F7E

Opal

# B3CCCA

Cascade

is a very unsaturated 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

Dusty Gray

# A59192

or triadic complementary

Gray Olive

# A5A491

and triadic complementary

Mountain Mist

# A491A5

To a colorblind person appears

Silver Chalice

# 9e9e9e