White as snow

I'm white as snow,

and black as coal;

I walk but have no feet;

I speak but have no mouth.

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Scroll down for answer and notes.

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This riddle may be outdated these days in a world of email, but I like the walking and speaking part. The version I found was not told in first-person, but I thought it was more cool that way! For black and white, see this riddle.

Letter or postcard.