Simplify the following text for a Grade 9 native English-speaking person.
Original: Mixing nominally equal proportions of the additive primaries results in shades of gray or white ; the color space that is generated is called an RGB color space .
Simplified: Mixing equal proportions of the additive primaries results in shades of gray ; when all three colors are fully saturated , the result is white . The color space that is generated is called the RGB ( `` red , green , blue '' ) color space .