New Jersey Cosmetology and Hairstyling Practice Exam

The preferred method for applying hair dye is with a brush for an even application. Using a brush allows for precise control over the application process, ensuring that the dye is evenly distributed throughout the hair. A brush can effectively separate the strands, allowing the stylist to work it into the hair more thoroughly and reduce the risk of missing spots. This method also helps in achieving a more uniform color result, which is essential for a professional finish.

In contrast, applying hair dye using fingers can lead to uneven results and may not adequately saturate the hair, particularly for large sections. Injecting with a syringe is not a common method for dye application and could create issues with the precision and evenness of coverage. Lastly, using a sponge may result in a soft finish but lacks the precision necessary for thorough dye application and might not evenly distribute the color as effectively as a brush would. Thus, using a brush is the most effective and professional method for applying hair dye.