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Cargille Gem Refractometer Liquid 10g
Cargille Gem Refractometer Liquid 10g
Click to enlarge

Cargille Gem Refractometer Liquid 10g

Item Number 04088-AB
Availability In Stock
Price  $76.65

The Cargille Gem Refractometer Liquid has a refractive index of nD = 1.810, the highest of any liquid not containing arsenic. It is widely used with gem refractometers as a contact medium for the identification of gemstones. This light yellow liquid can also be used to reduce or eliminate glare from a gem's surface, facilitating inspection of the gem's interior for inclusions and other defects.

Remember that we offer a complete range of refractive index matching fluids.

This liquid is supplied in an amber glass bottle. The cap has a glass applicator rod attached to it on the inside, designed to deliver a small droplet.

To ensure the liquids maximum shelf life, keep this liquid tightly sealed after opening, store it away from direct light and in moderate temperatures.

Specifications:
nD = 1.81 +/- 0.005 @ 25°C

Documents
Composition Methylene Iodide with dissolved solids
Appearance Golden yellow liquid
Odor Characteristic
 
Color Stability In sun: Will become very dark after I day
(Note: When stored in the dark the color is stabilized for up 5 years by the small piece of copper normally placed in the bottle by Cargille Labs)
 
Index Change Rate by Evaporation High: A 1/4 fl. oz. bottle open 5 days: full bottle changed +0.00130; half full (10 gram) changed +0.00207
 
Pour Point °C < 20
Boiling Point °C @ 760mm Hg > 180
Flash Point °C COC None
Density g/cc @ 25 °C 3.135
Density Temp. Coef. g/cc °C -0.0023
Coef. of Therm. Exp. cc/cc/ °C 0.0007
Viscosity centistokes @ 25 °C 2
Soluble: No common solvents  
 
Partly Soluble: Acetone, Carbon Tetrachloride, Ethyl Ether, Methylene, Chloride, Toluene, Xylene
 
Insoluble, Ethanol, Freon TF, Heptane, Naphtha, Turpentine, Water
 
Clean Up: Wipe until dry with tissue, then use soap and water if further cleaning needed. Avoid letting liquid evaporate leaving crystals behind. To help remove crystals: Soak in soap and water or Carbon Tetrachloride or use of scouring pad when not injurious to item cleaned.
 
Compatibility: May soften some plastics (Especially Polystyrene, Polyethylene, and Polyurethane) and may affect epoxy, rubber (including Silicone and Neoprene), and will corrode Aluminum, Brass, Copper, and Steel
 
Toxicity      Moderate (request MSDS)
 
Cauchy Equation: Refractive index as a function of wavelength at 25 °C
W = Wavelenght in angstroms (Å)
n(W) = 1.756723 + (1463579) /W^2+ (1.34422E+13) /W^4



Source or Wavelength Refractive Index % Transmittance 25 °C
Spectral Line (angstroms) 25 °C 1 mm 1cm 10cm

Near UV cut off 4500 1.86 5 0 0
F (Cd) 4800 1.846 88 28 0
F (H) 4861 1.843 89 32 0
Ar laser 4880 1.842 90 35 0
e (Hg) 5461 1.821 95 62 1


d (He) 5876 1.810 98 82 13
D (Na) D1, D2 mean 5893 1.810 98 82 14
He laser 6328 1.802 99 90 35
C (Cd) 6439 1.800 99 91 40
C (He) 6563 1.798 99 92 43


Ruby laser 6943 1.793 99 94 55
GaAs laser 8400 1.780 100 99 90
Nd: YAG laser 10648 1.77 100 97 74
Diode 13000 1.77 100 100 96
Diode 15500 1.76 99 93 49


nF - nC =      0.0448
Abbe vD: (nD - 1) / (nF - nC) =      78.1
Temp. coef dnD / dt 20 - 25 °C =      -0.000680