Black granite countertops are naturally porous and prone to damage if not properly maintained. Granite countertops with a high percentage of quartz will be more durable than those with less quartz and are less resistant to damage than others. Assess the type of damage that has occurred in granite before attempting to repair the kitchen table. Typical damage to granite includes stains, scratches and chips. Repairing a granite countertop can be difficult, depending on the type and extent of the damage.
Stains should be soaked in water immediately after notice to help wash material out of granite. Using a sponge dipped in warm water, energetically rub the stained area of black granite countertops. Do not use steel wool or other abrasive objects. If the stain does not disappear, leave the warm water-soaked sponge on the stained area for several hours.
Make a solution of 75% hydrogen peroxide and 25% water and test it on a small area of the black granite countertops, which will not be noted to see if discoloration occurs. Apply the solution to the stained area with sponge and rub the stain if no discoloration appeared. This method is only recommended for light granite. According to the Marble Institute, beauty salon grade hydrogen peroxide will work best mixed with a few drops of ammonia.