This specification covers two grades of kerosine suitable for use in critical kerosine burner applications: no. 1-K - a special low-sulfur grade kerosine suitable for use in nonflue-connected kerosine burner appliances and for use in wick-fed illuminating lamps, and no. 2-K - a regular grade kerosine suitable for use in flue-connected kerosine burner appliances and for use in wick-fed illuminating lamps. Kerosine shall be a refined petroleum distillate consisting of a homogeneous mixture of hydrocarbons essentially free of water, inorganic acidic or basic compounds, and excessive amounts of particulate contaminants. The flash point, distillation range, viscosity requirements, sulphur requirements, mercaptan sulphur, copper strip corrosion, freezing point, burning quality, and saybolt color shall be tested to meet the requirements prescribed.