Understanding the color circle will help you formulate, design and correct anything that comes your way! Watch this video from OYA to gain a better understanding of how mixing the primary colors and combinations in the circle will allow you to achieve your desired hair color results.
Another important step to creating successful color is knowing how to correctly utilize underlying pigments. Learn how to factor in hair's underlying pigments from dark reds to pale yellow to get your target color.
[Videos courtesy of OYA]