Cargille Type B immersion oil is the ideal choice for high-volume, general-purpose microscopy. The high viscosity provides better longevity than Type A oil, making it suitable for multiple uses without the need to re-apply. Type B immersion oil is better suited for professional use. Immersion oil is necessary for high magnification microscopy when using oil-immersion objective lenses. Do not use with dry or water-immersion lenses. Immersion oil should also be used on oil-compatible light-condensers when working at high magnifications, as the oil ensures a consistent refractive index throughout the optical path, providing the highest resolution possible. For beginners and occasional users, Type A low-viscosity immersion oil is recommended because of its ease of use. For advanced and frequent users, Type B high-viscosity immersion oil provides better longevity for use with multiple slides without the need to re-apply. Immersion oil is not soluble in water. To thin or remove, use naptha, xylene, or turpentine, including Sparkle cleaner. Always follow standard safety protocols. Refractive Index: 1.515 (589.3nm @ 23°C) Viscosity: 1250 cSt ±10% @ 23°C Volume: 1 fl.oz. (30ml) Storage Temperature: 4°C to 40°C Use only with objective lenses designed for oil-immersion. For laboratory use only. Not for consumption.