Screen Print 101: The Underbase

 

What is an underbase?

The underbase or underlay color is the first color printed before the design is printed on top. Usually this color is white, but in some instances, the printer may opt to print a black underbase instead.

 What is the underbase used for?

The underbase is the first ink barrier between the garment and the actual design. There are several reasons to use an underbase ranging from dye migration mitigation and to ensure colored inks print correctly. Screen print inks are semi-transparent, so they show the garment or design underneath to a limited extent. If you want your colors to appear true, you should underbase in white. If you have a sublimated shirt that has a pattern (like camo), you should underbase in black. The "barrier black" as we call it, does a better job of hiding the sublimated pattern than white does.

 How do I know if my shirt needs an underbase?

Ask yourself a few questions. Is my print any color other than black or white?
Is my print going on a dark colored shirt?
Does my shirt have a visual pattern, like camo?
If you answered yes any of those questions, it is very likely you will need an underbase. You should consult a screen print press operator to double check if you do.

 Are there instances when I shouldn’t use an underbase?

Certainly! If you want a vintage appearance to your design you should not underbase your design. This will give a softer feel and make the print appear as if it’s faded. You may also choose not to underbase a design with a lot of gradients or halftones in the design. You may also want to create multiple shades of the same color without spending on an additional screen. If you are printing on dark pieces, you can often create a true red and a dark red using a combination of underbasing some areas and not underbasing others. Finally, some colors just don’t need an underbase. These are often darker colors like black, navy, dark green, and sometimes charcoal.

In short, you'll want to discuss the need or possibility of using an underbase on your screen print design. Since screen print is often charged based on number of colors printed per print location, knowing if you need to add an additional screen to your order will ensure you can accurately predict how much you're going to spend on your order.

To learn more visit us at www.tshirtauthority.com
info@tshirtauthority.com | 704-847-4280
9535 Monroe Rd #140
Charlotte, NC 28270

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