Shred a ball of steel wool and place it into a glass jar. Fill the jar with white vinegar until the wool is covered and screw on the lid.
Leave the vinegar solution to sit for at least 24 hours. The steel wool will start to dissolve, so the longer you leave it, the more the mixture will combine.
Pour 1/3 cup of boiling water into another jar and place the tea bag into the water. Leave the bag to steep until it is as strong as possible.
Paint the wood with the tea in long, even strokes and leave it to dry. Make sure the wood is completely covered in tea.
Brush the vinegar mixture onto the wood once the tea has dried. Leave the vinegar to cure for 10 minutes to 1/2 hour to allow the antiqued color to come through.