Put on plastic gloves in preparation for working with the borax.
Place 3 ozs. of sodium tetraborate into 1 gallon of warm water. Stir with a spoon until the sodium tetraborate is completely dissolved.
Set up a work space outside or in a location that can get wet, such as a garage. Place the wood item that you wish to age in this area.
Soak your rag with the sodium tetraborate solution and apply it to the wood item. Make sure to completely cover it with the solution.
Allow to sit and dry for 24 hours before checking the appearance. If it is not sufficiently aged, apply the solution again with a scrub brush. Allow the piece to sit for an additional 12 to 24 hours. Repeat as needed until the desired appearance has been achieved.