Riddle

I am white when I am dirty, and black when I am clean. What am I?

Choose an answer

A.A whiteboard
B.A mirror
C.A chalkboard eraser
D.A blackboard.
Hint: It's a 2-word phrase with 11 letters, starting with "A".

Answer

A blackboard.

Why this is the answer

A blackboard is literally black, but chalk dust (dirt) makes it look white/pale, so it's paradoxically 'white when dirty.'

This riddle is filed under Color Riddles and rated Easy.

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