GAF modified bitumen colors are applied during the asphalt or bitumen modification processes by incorporating color additives directly into the bitumen or asphalt mix. This is typically done by blending the color pigments with the modified bitumen before it is mixed with aggregates. The pigments are designed to withstand high temperatures and provide long-lasting color stability. This process enhances aesthetic appeal while maintaining the performance characteristics of the asphalt, ensuring durability and resistance to environmental factors.