A tertiary color is created by mixing a primary color with a secondary color. The secondary colors are green, orange, and purple, created by mixing primary colors (red, yellow, and blue).
Let's analyze the colors you provided:
- Purple-green: This is a mix of purple (a secondary color) and green (another secondary color), making it a tertiary color.
- Red-orange: This is a mix of red (a primary color) and orange (a secondary color), making it a tertiary color.
- Blue-green: This is a mix of blue (a primary color) and green (a secondary color), making it a tertiary color.
- Yellow-orange: This is a mix of yellow (a primary color) and orange (a secondary color), making it a tertiary color.
After reviewing these options, all of the colors listed are considered tertiary colors. Therefore, none of the colors you provided are "not a tertiary color." If you are looking for a color that is not a tertiary color, it would need to be either a primary or secondary color.