if your , let say screenprinting a irish flag on a black shirt ( green white orange colors ) do you need 3 screens or 4 what i mean is if its 3 screens you would have the whole flag in white then you would flash-reapply then flash-then add additional colors ? or do you have 4 screens one being the white underlay (the whole flag) 2 would be a seperate white 3 would be the green 4 the orange - have a job coming up like this need input please