I used Tarn-X on my sink and the patina is ruined!

A. Hi Lori, corrosive cleaners like Tarn-X will quickly strip the patina from copper sinks like yours and the acid will result in the cupric oxide (green corrosion similar to when pennies are left in water). You first need to strip the entire surface with an abrasive material or pad then apply a chemical patina to restore the brown/black appearance it once had. BarrysRestoreItAll, the makers of Scratch-B-Gone has a D-I-Y Copper Patina Repair kit just for this issue. You will be surprised at how many people have this problem so you're not alone. Care must be taken in cleaning this finish as it is delicate and highly reactive to traditional clears. Waxing your basin will greatly help protect the finish. We have this also. Good luck and have a wonderful Thanksgiving