____ primers were developed because acid-based nail primer is corrosive to the skin and potentially dangerous to eyes.

Acid-free and nonacid primers were developed as a safer alternative to traditional acid-based primers used in nail applications. Acid-based primers can be harmful because they can cause skin irritation and are corrosive, posing risks to the eyes if contact occurs. The development of acid-free and nonacid primers allows nail technicians to achieve a strong bond for nail enhancements without the associated risks of irritation and damage that acid-based products can cause. These newer formulations still provide effective adhesion while prioritizing safety for both the client and the technician, making them the preferred choice in modern nail services.