Billygee....

I don't use enough colorant to draw a line. I just put a very small spot of it at the front of the belly pour and at the rear of the belly pour. The spot of cor is only about as big s a head n a common pin....smaller even. I also let those belly pours get cold before I add the color otherwise the colorant will cook hard enough to prevent the color-drag you want when you inject the top color.