• A blue colored flame indicates that the flame is close to the ideal temperature for annealing copper. A flame that is too hot will burn the copper, while a flame that is too cool will not be strong enough to change the copper's properties like durability and malleability.
• Constantly moving the flame will help to avoid burning the copper. It is at the correct temperature for annealing purposes when the entire copper surface area is glowing cherry red.
• Grip the copper and place it into a bucket of cold water.
• Remove the copper from the bucket of water once it returns to its original color.
Cooling rate after annealing does not matter.