Gem Refractometer Liquid nD = 1.81 (589.3nm at 25.0°C)

· Identify minerals, ores, chemicals, specimen fragments, plastics, gems, translucent or transparent solids by microscopic immersion techniques.
· Temporarily mount specimens in various index media for matching or contrasting index combinations.
· Microscopically study solids by dispersion staining, focal masking, and double variation refractometry techniques with high dispersion liquids.
· Calibrate refractometers and other optical instruments.
· Instruct and exhibit principles and applications of refraction.
· Determine refractive index of specimens by referral to calibration curves relating wave length to index of refraction.
· Examine stress and strain effects of transparent or translucent items; molded, formed, curved or intrinsically shaped parts by polariscopic immersion technique. (Immersion Liquids)
· Identify salts precipitated from body fluids and measure relative amounts of sodium and potassium chloride for indicating toxemia.
· Couple optical elements with liquids formulated for refractive index and viscosity.
· Obtain unique optical properties of hollow lenses by filling with index of refraction liquids.
· Examine and preserve cathode coating without stripping or re-immersion by utilizing oils matching index of crystals.
· Identify particles and particulates from air or water.
· Photograph flow patterns by filling test system with refractive index liquids having suspended "beads".