Item Description: 10 Gram Vial of 1.81 Refractive Index for Gem RefractometersAmerican Made and ARSENIC FREE!The most important aspect of the Refractometer is the quality of the fluid and its Refractive Index. This product has a Refractive Index value of 1.81RI and is THE best product for accurate GEM Identification.The 10 Gram Vial holds about 2.5ml of productThe Gem Refractometer Liquid has a refractive index of nD = 1.810, the highest of any liquid not containing arsenic. As the name implies, 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.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:Refractive Index @ 25'C: nD = 1.81 +/- 0.005 @ 25°CAppearance and color:Golden liquidBoiling Point at 760 mm Hg: 181° C (358° F)pH: Not applicableVapor Pressure: 760 mm Hg @ 23° C/73° F...1.5Viscosity: Not applicable, but close to an ISO 5Specific Gravity (water = 1) @ 23° C/73° F: 3.14Water solubility: SlightOctanol/Water Partition Coefficient in Kow: Specific value not knownMelting/Freezing Point: 20°C (68°f)Evaporation Rate (mineral oil = 1, 760 mm Hg, 73° F/23° C): 1This product is the non-poisonous version of the classic Gem Refractive Index Fluid; Diiodomethane (methylene iodide). It is not carcinogenic according the the product MSDS.** Shipping **Domestic S&H is $6.00 for (1) Vial, and an extra $1.00 per extra Vial. For international shipments is is $15.00 ($12.00 to Canada)Air Mail via USPS (4-7 business days) and $1.00 for each additional Vial. For inquiries about this product, please contactus at the e-mail address below. We also carry Refractometers, Loupes and Calcite Dichroscopes too! Check out our eCRATER Store! Save on S&H!National Industrial Supply 2767 Maricopa StreetTorrance, CA 90503, USASales: (310) 748-6858Fax: (310) 833-7306E-mail: eCRATER no longer allows us to show thisTimezone: -8:00 GMT We prefer Paypal! We accept Credit Cards via Phone, Fax or E-mail too!On Nov-24-02 at 02:27:00 PST, seller added the following information: After purchasing, pay instantly with your credit card through PayPal! Froo www.froo.com | Froo Cross Sell, Free Cross Sell, Cross promote, eCRATER Marketing, eCRATER listing Apps, eCRATER Apps, eCRATER Application Froo www.froo.com | Froo Cross Sell, Free Cross Sell, Cross promote, eCRATER Marketing, eCRATER listing Apps, eCRATER Apps, eCRATER Application