2torial #0678: Learn2 Shop For a Computer Monitor (continued) Understand color purity Primary colors should stay primary. The image that you see onscreen is actually made up of three colors: red, green and blue. A poorly designed or defective monitor will let these colors bleed into another. For example, white areas on the screen may develop a noticeable tint from a nearby colored image. A rainbow effect, or moire pattern, may become visible under some circumstances. Color impurities can also arise when a monitor needs to be degaussed. If the store will allow the monitor to be turned off for an hour (and you have the time to spend) do so and return after the hour. Most monitors will degauss when allowed to cool down completely. You may then determine if the impurity is still noticeable. Step 6