Hola Greta,
Estoy de acuerdo con Roberto Hall en cuanto a que es un tipo de prueba, encontré esta explicación que lo corrobora:

"HOW DO I GUARANTEE MY PAINT WILL BE CORRECT?

A SPRAYOUT!!! A sprayout can save everyone a lot of time, money and frustration. It takes five minutes, but can save hours.

Here's how to do it:

A sprayout is the very most important thing you can do before painting your vehicle. It helps determine how much paint you need, how to apply the paint, and gives you a feel for using the paint. You cannot expect good results without first doing a sprayout.

*****A sprayout is simply testing the color before you apply it to the actual repair job.***** If you are using a touch-up pen, just test the color on a piece of scrap you may have lying around. If the color takes a base color, test the entire application. Make sure you feel comfortable before attempting the actual repair by practicing the entire application.

If you are using any method of spraying the color, test the color on a sprayout card or on anything that you can accurately see the color. A piece of scrap metal is perfect for this if you do not have access to a spray-out card. Remember, you have to apply the clear too. It won't look the same without it.

If you are sending your parts and paint to a body shop, make sure they are willing to do a sprayout. Any body shop worth its weight will automatically perform a sprayout, but make sure they do it. Also, bring them a part of the vehicle with you so that they can obtain a proper match when the do the spraying. A body shop cannot be expected to match a color when they do not know what it looks like."

http://www.color-rite.com/Sprayout.php

Buena suerte y saludos del Oso ¶:^)