Screen Printing
Spot Color
Spot color printing mixes one exact premixed ink for each design color and pushes it through its own screen, instead of blending it from tiny dots.
Spot color printing means every solid color in a design gets mixed as its own exact ink — usually matched to a Pantone number — and printed through its own dedicated screen. A three-color logo runs as three screens and three ink mixes, each one a flat, uniform block of color rather than a blend built from overlapping smaller dots. There's no averaging or dithering involved; what's on the screen is the color that lands on the shirt.
This is why screen-print quotes are priced per color instead of a flat rate: a five-color design costs more to run than a two-color one because each spot color means another screen to burn, mount, register, and clean, not because more ink physically goes on the shirt. On a run of company polos, it's also why this year's navy matches last year's exactly — the same Pantone mix gets pulled every time.
Spot color is the right call for logos, mascots, and flat graphic art with clean color breaks; it's the wrong tool for photographs or gradients, which need halftones or a simulated-process approach to fake continuous tone from solid ink. Pros count colors in the artwork before quoting, since a gradient hiding inside a 'simple' logo can turn a two-color job into a six-screen one.
Buyers sometimes assume more colors in a JPEG automatically means more spot colors on press, but anti-aliased edges and slight color drift in a low-quality file often aren't intentional design colors at all — a good print shop cleans the art up into true, flat colors before it ever touches a screen.