Exposure to 18 mol/L hydrochloric acid (HCl) on the skin can lead to significant damage, potentially causing chemical burns similar to first, second, or third-degree burns. Immediate effects may include skin irritation, redness, and a spongy texture where contact occurred. Washing the affected area with cool water for an extended period, such as fifteen minutes, is crucial to mitigate damage. While some individuals report no lasting effects after such exposure, others have experienced soreness and redness for days. Comparisons to sulfuric acid exposure highlight the risks associated with strong acids, emphasizing the importance of safety precautions in laboratory settings. Overall, while lower concentrations like 1M HCl may be manageable, higher concentrations pose serious risks and should be handled with care.