The most common form of commercial T-shirt decoration is screen-printing. In screen-printing, a design is separated into individual colors. Plastisol or water based inks are applied to the shirt through mesh screens which limits the areas where ink is deposited. In most commercial T-shirt printing, the specific colors in the design are used. To achieve a wider color spectrum with a limited number of colors, process printing (using only cyan, magenta, yellow and black ink) or simulated process (using only white, black, red, green, blue, and gold ink) is effective. Process printing is best suited for light colored shirts. Simulated process is best suited for dark colored shirts.
Since the 1960s, T-shirts have flourished as a form of personal expression. Screen printed T-shirts have been a standard form of marketing for major American consumer products, such as Coca-Cola and Mickey Mouse, since the 1970s. It has also been commonly used to commemorate an event, or to make a political or personal statement.