Is it possible to change all the blacks in the artwork to transparent?

[#1]

I am making a design for a tshirt. Since the tshirt is black I wanted to change all the blacks to transparent.

Is there anyway to do this?

[#2]

Mokshabir,

You can use Select>Same>Fill Color and Select>Same>Stroke Color and change all instances of each kind.

Depending on the printer, there may be a safe way of keeping the appearance of the black, obviously more requiring if it is a rich black.

[#3]

It sounds like you need to knock the black colors out of the other colors so that the black tee shirt will show through. To do this you should use the shape builder tool.