PRINTING/UNDERBASE
 
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Here is a white print as it will look with one layer of ink on a dark shirt, this shirt being black.
 







Here is the same image when printed with two layers of ink. The first layer has to be cured before the second layer is printed. To understand this better think of painting a dark wall with white paint. The primer (first layer of paint) would have to dry before the second layer of paint is put on.