O.N Cooling Solution | Secondary Numbing Anesthetic | Professional Use Only | BY OLGA NIKOLOVAO. N Cooling Solution is a professional secondary anesthetic designed to be used during procedures on open skin. It helps reduce discomfort, swelling, and bleeding, allowing artists to work with greater precision and clients to feel more comfortable throughout the treatment. Formulated specifically for experienced professionals, this solution supports smoother procedures and improved client experience during permanent makeup and tattoo services. Key