When cooking foods in a copper chef pan or other copper chef cookware you should avoid using any metal utensils.
If you use metal utensils when cooking in copper chef pans or copper chef cookware you risk scratching the copper chef pans.
When you scratch the copper chef pans or cookware it removes and damages the copper chef cookware coating which helps to prevent the food from sticking to the cookware.
So you should use plastic cooking utensils such as plastic spatulas etc when you cook in the copper chef to avoid damaging it.
The copper chef cookware is designed so that you don't need to use oil or butter etc to prevent food from sticking but if you use metal utensils on the copper chef cookware and damage it then your food will begin sticking.