Spot Colour with Halftones
This process is essentially the same as the Spot Colour technique but includes halftone dots of ink as well as solid areas. This makes a single color of ink appear as two or more shades of that color. These halftone dots can also be printed over other colours in your design to create more shading effects.
This is great for achieving the effect of having more colours than you actually do. So you can get an interesting looking print without needing alot of colours .
This method has many advantages over CMYK 4 Colour Process Printing, in that you get the exact mixed shades of colour that you're expecting, rather than hoping the CMYK produces the correct Pantone colour in your logo or design. It also means reruns will turn out just the same as the first order, where this is sometimes difficult to guarantee with CMYK.