How does the next paragraph end?

How to anneal copper
Connect the red welding torch hose to the acetylene tank, and the black hose to the oxygen tank.
The acetylene tank is used for starting the flame and the oxygen tank is used to continue feeding the flame and to control the intensity of the flame.
Put on your safety goggles.
Wearing safety goggles is a precaution necessary to ensure eye safety anytime you are working with open flames. Switch on the acetylene by turning the valve halfway.