From the desk and experience of my mom:
Use this mixture to cover scratches and renew the finish of antique pieces without the hassle of refinishing.
1.) Mix equal parts boiled linseed oil, white vinegar and mineral spirits in a glass jar.
2.) Apply the mixture to the finish using 0000 grade steel wool. Scrub in small circles to re-spread the finish over the scratched areas and lift paint. Allow to dry.
3.) Buff the finish using a soft, lint free, cotton cloth. (An old t-shirt works well.)