Clay pots gradually whiten with age, showing evidence of minerals leaching from water through the years. Here's how to get that charming, weathered look without waiting.
Martha Stewart Living, March 2002
Stir 1 cup of lime powder, a mineral available at garden centers, into 2 cups of water until it takes on a thick, gravy-like consistency. With a bristle brush, paint the solution onto pots, sparingly in some places and generously in others.
When the pot is completely coated and still wet, spray some spots with water from a spray bottle on the "stream" setting to let some of the lime solution run off.
Allow the pot to dry, then sand in a random pattern with medium-grit sandpaper (about 150 grit) until you are satisfied with the gently mottled surface.