How does blue curacao turns blue?

Fungi

The sun goes down and the moon passes it by the sun alone is yellow by earth, but once the sun and moon pass each other the moon gives it the orange

Obviously you didn't turn blue. If you did run around crying and screaming,"It doesn't happen!!!"

Unfortunately for consumers, it comes from artificial coloring.

It depends how dark they are. Check the label for washing instructions, turn them inside out, or be on the safe side and wash them with colors.