1. Hold the teeth on one side of the key over an open flame until they are charred. Use a lighter or a lit candle. Move the teeth of the key back and forth ... 2. Stick a piece of clear tape on the blackened side of the key. Cut a piece of clear tape the same length as the key. Standard sized clear tape should work ... 3. Remove the tape slowly after 10 seconds. Peel the tape back, being sure that it doesn’t fold or crease. The char will leave residue on the sticky side of ...
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