 Re: questions on colors in screen printing
if you're printing white on a shirt (like not just using the white of a shirt in the design), then yes. If you need a white underbase (for instance, in putting a bright color on a dark, you may need a white underbase), then your screen printer will probably count this as an additional color as well.
What your printer may do in the case of the blacks is do a halftone rip of the blacks in the image, in which case the 15% will be composed of very tiny dots, and the 50% of slightly larger dots, and they will both be on the same screen and count as one color. I think that'd probably be the best way to go about it, but I'm not entirely sure.
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