Pure liquid nicotine refers to nicotine in its liquid form that is free from any additives or dilutions. It is commonly used in the manufacturing of e-liquids for vaping devices. Pure liquid nicotine is highly concentrated and should be handled with caution due to its toxicity. It is often available in various concentrations, typically ranging from 99% to lower concentrations for vaping purposes. When purchasing pure liquid nicotine, it's essential to ensure that it meets quality standards and is sourced from reputable suppliers to guarantee safety and purity.