How can I change the colour of a stain?

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Offline thedoc

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How can I change the colour of a stain?
« on: 22/04/2016 19:50:01 »
Dave asked the Naked Scientists:
   I have a customer with a blue stain on a carpet. The carpet is red, can I bring the blue back to red?
What do you think?
« Last Edit: 22/04/2016 19:50:01 by _system »