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Which of the following is an antiseptic technique used in a salon environment?

  1. Applying UV light

  2. Boiling water immersion

  3. Sanitizing surfaces

  4. Sterilizing metal tools

The correct answer is: Applying UV light

UV light is the correct answer because it is commonly used as a disinfectant in a salon setting. Boiling water immersion is not a commonly used antiseptic technique in a salon and can also damage certain tools. While sanitizing surfaces and sterilizing metal tools are important steps in maintaining sanitation, they are not considered antiseptic techniques.