Tear the steel wool pad into tiny pieces and place them into the glass jar.
Fill the jar with vinegar. The steel wool should be completely covered with vinegar.
Close the jar and set it aside for one full day. As it sits, the vinegar will partially dissolve the steel wool.
Put the teabag into another glass jar and pour boiling water over the top. Allow the tea to steep for 10 minutes.
Dip the paintbrush into the tea and paint the wood. Cover every surface with tea. Allow the tea to dry.
Brush the vinegar steel solution onto the wood after the tea has dried. The two solutions will react, creating a gray color.
Allow the wood to dry completely.