Microscope Immersion Oil Type B, 1 Oz (30mL) - High Viscosity

In this review the AmScope ML-B-1-A Microscope Immersion Oil Type B is evaluated for laboratory and professional microscopy use. The bottom line: this 1 Oz (30mL) bottle is for users who need a high-viscosity, reusable immersion oil with a stable refractive index of ND 1.515 standardized at 23 C. It is best suited to frequent users who require consistent optical performance at high magnifications and for oil-immersion objectives; beginners may prefer a lower-viscosity Type A oil for easier cleanup.

Key Features

• Type B high viscosity: Higher viscosity increases longevity on the lens so the oil remains effective across multiple uses before needing reapplication.
• Refractive index ND 1.515: Matches the optical path at high magnification to provide improved resolution and image contrast when used with oil-immersion objectives.
• Volume 1 Oz (30mL): A small, serviceable bottle size that is convenient for bench use without excessive waste for individual labs or classrooms.
• Meets ISO-8036/1: Standardized manufacturing ensures consistent performance and compatibility with oil-immersion optics and condensers.
• Safe for lenses: Formulated to be safe on optical lens surfaces when used as directed and not intended for dry or water-immersion objectives.

Who It's For

The Type B immersion oil is designed for professional microscopists, clinical labs, and advanced hobbyists who work frequently at high magnifications and need a stable, reusable oil. Its higher viscosity and standardized refractive index are advantageous when consistent resolution and minimal reapplication are priorities.

It is not the best choice for occasional users or beginners who prefer an easier-to-handle, lower-viscosity oil (Type A). Also avoid using this oil with dry or water-immersion lenses; it is formulated specifically for oil-immersion objectives and oil-compatible condensers.

Pros & Cons

Pros

• High viscosity provides better longevity and fewer reapplications for frequent use.
• ND 1.515 refractive index gives consistent optical matching for improved resolution at high magnification.
• ISO-8036/1 compliance and lens-safe formulation reduce variability between batches and protect optics when used correctly.

Cons

• Higher viscosity makes cleanup and handling slightly more involved than low-viscosity Type A oil.

Specifications

Product name	ML-B-1-A Microscope Immersion Oil Type B
Volume	1 Oz (30mL)
Refractive index	ND 1.515 (standardized at 23 C)
Viscosity type	High viscosity (Type B)
Standards	Meets ISO-8036/1
Intended use	Oil-immersion objective lenses and oil-compatible condensers

Our Verdict

The AmScope Type B immersion oil is a solid choice for professionals and advanced users who need a stable, reusable oil with a precise refractive index for high-magnification work. It provides good value for frequent users because the higher viscosity reduces how often oil must be reapplied, though occasional users may prefer a lower-viscosity alternative for easier handling.

Frequently Asked Questions

Can this oil be used with water-immersion lenses?
No. This Type B immersion oil is formulated for oil-immersion objectives and should not be used with water-immersion or dry lenses.

Is the refractive index temperature dependent?
The refractive index is standardized at 23 C (ND 1.515); significant temperature deviations can affect optical matching, so work near the standard temperature when possible.

How much is in the bottle?
The product comes in a 1 Oz (30mL) bottle, a convenient size for bench use without excess waste.