What preparation should I do before applying this hair color to avoid unexpected results?

Before full application, mix a small amount of the dye and apply it to a discreet section of hair (like behind the ear or at the nape) using your usual application technique. Leave it for the recommended processing time, then rinse and evaluate both the color result and how your scalp responds. This strand test reveals how your hair will absorb the Golden Chestnut shade and whether you need to adjust processing time or anticipate color correction needs.

Simultaneously, apply a small amount to your inner elbow or behind your ear and wait 48 hours to check for allergic reactions. This is especially important with permanent dyes, as the ammonia and peroxide can cause irritation even in products formulated to be gentler. If your hair has been bleached, relaxed, or chemically treated within the past month, or if you have a sensitive scalp, consider doing a porosity test - drop a strand in water and see if it sinks quickly (high porosity) or floats (low porosity), which affects color absorption and final intensity.