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Black monochrome PNGs?

Hi. I was hoping someone might be able to help. I've been trying to upload some images to a t-shirt printing site. The images are black and white photos, and I'd like to upload files that when put on the shirts, don't have any white, and are just black ink on whatever colour the shirt happens to be. I can't figure out how to do it. Whenever I make a mono png, it still retains the white. I'm sure there's a simple trick. Could someone please let me know?

Many thanks