The "index" is the strength of embalming fluid, measured by the grams of pure formaldehyde gas dissolved in 100 milliliters of water. It's kind of like measuring the proof of alcohol; some people need stronger mixtures than others.
The index of the fluid in the manufacturer's bottle is different from the index of the solution we inject into the body. Typically, two or three 16 oz. bottles of embalming fluid are mixed with water and miscellaneous accessory chemicals (water conditioners, humectants etc.), resulting in about three gallons of solution (varies by body).
The formula used to calculate the final strength/index of the mixed solution is loathed by mortuary science students everywhere: C x V = C' x V'
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