Skulls, skulls and more skulls

I'm in the process of testing a new design - it's a pattern of repeating skulls. The idea is that I can use one large background and print overall patterns (in white) onto small black objects such as skinny ties, iphone covers, wallets etc.

I've already burned the image to a screen and test printed a tie. However the print didnt turn out so great. After a bit of logical thinking I discovered that i would have to invert the colours in order to get the print to be the same as the one pictured.

I'll post some shots of some finished prints once the screen is burned :)