What is a crucial step to minimize allergic reactions when applying hair color?

Performing a patch test before applying hair color is essential in minimizing allergic reactions. This test involves applying a small amount of the hair dye to a discreet area of the client's skin, usually behind the ear or on the inner arm, and then waiting 24 to 48 hours to observe for any adverse reactions. If no irritation or allergic response occurs, it indicates that the client is likely safe to proceed with the full application.

The importance of this step lies in the fact that hair color products may contain various chemicals that can trigger allergies in some individuals. By conducting a patch test, you can identify potential sensitivities beforehand, ensuring a safer experience for the client and preventing possible severe allergic reactions during or after the coloring process.