Immersion oil is a specialized oil used in microscopy to increase the resolution and clarity of images obtained through a microscope. It has a pale yellow to yellow color and is slightly viscous, but not insoluble in water. The standard for immersion oil is Q/SOCC 12-2005, which ensures that it meets certain quality and safety standards. The refractive index of immersion oil typically falls within the range of 1.5148-1.5152, which matches the refractive index of glass and allows for optimal light transmission through the microscope. The acid value of immersion oil, measured in mgKOH/g, is typically less than 60, which indicates that it is a low-acid oil. In addition, immersion oil must pass a xylene dissolution test to ensure that it is of high quality and suitable for use in microscopy-Enhance Your Microscopy Experience with RMY Immersion Oil - Achieve Higher Resolution and Clarity"-Experience Superior Microscopy Results with RMY Immersion Oil - Optimal Light Transmission and High Quality.