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Printing a full color picture on a dark shirt is one of the toughest jobs a screen printer faces. Normal four-color process uses clear inks: Cyan (sky blue), Magenta (hot pink), Yellow and Black) which print in a variety of proportions, mixing together to create a wide range of colors. While this method works superbly on a white shirt, the results may be disappointing on black shirts, requiring a underbase and numerous passes of colors ending up with a thick ink layer and dirty color. While good four-color process can be carried out on a dark shirt, to take action takes a great deal of analysis, time, and tweaking during the print run. But there's another way to achieve similar results far more quickly.
Opaque inks are used by simulated process and in significantly more than just four colors, frequently between six and nine (often White, Red, Yellow, Green, Dark Blue, Light Blue, Gray, and Purple). Simulated process colors usually are printed wet-on-wet, with few sensations (a drying process whilst the top continues to be on the press). For example, to produce a skin tone simulated approach would work with a blend of tan, opaque yellow and probably white. Since the colors are opaque, the dark history becomes a non-issue (or at least not as of one). And if personal, specific colors are needed (for example a precise shade of red for a small business logo) they can be combined to specification and separately produced.
So why could you want to use four-color process at all? It's the absolute most accurate model of full color reproduction, when done successfully and correctly. And for shops with smaller presses with fewer heads available, the numerous colors needed for simulated approach might not be possible at all. Also for simple, nuanced art with slight changes in tone, such as pastels, the vivid, strong colors of simulated process don't work very well.
While screen printing pictures on black shirts could be difficult, the outcome could be incredible and are worth the effort and time involved regardless of which form of printing you use. learn about linen shirts