fading the screen printing image

Hello Everyone,

I just started screen printing and have run into a problem that I hope some one will help me with. I am screen printing on a black sweat shirt and want to fade a square area from black to white. Could someone please tell me the procedures for doing this?

Location: 
United States

I hope others input here as well, But for the time being. I would have the art work done so that when I burn the screen it would lessen (fade) from the white ink untill it was no ink.

I might have misunderstood your problem. But in general it would be done with the art work, and burning the screen.