Has anyone tried using tea as a dye before?

3D Printing
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1

Has anyone tried using tea as a dye before? This looks awesome: http://www.shapeways.com/model/146656/universal-ring-dial-2.html

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I thought it would be dyed what color the dye didn’t absorb. Disclaimer: I’m an EE, not a chromopticdynetistic. Is that a word?