Some examples of what you can expect your floor to look like after refinishing. Notice how older floor coatings turned different colors over time. Refinishing brings back the natural colors of the wood.
BEFORE: A floor that was covered by a carpet for years
AFTER: Refinished with 3 coats of poly- urethane
BEFORE: Flooring that was salvaged from an old church and installed in a home
AFTER: Sanded and finished with 3 coats of poly- urethane