A little dab should be enough to take care of most small to moderately-sized jewelry, from rings to bangle bracelets to choker necklaces.
 Focus on the areas covered with tarnish. The acid from the tomatoes should be strong enough to dissolve the tarnish but too weak to damage the brass.
 Use a dry cloth to remove most of the ketchup. Follow with a damp cloth.
 Use gentle, circular motions.
Apply a bit of ketchup to a clean, soft cloth.
Rub the ketchup over the brass jewelry.
Wipe the ketchup off.
Buff the jewelry clean with a dry cloth.
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