Ink dating test consolidating school districts texas

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These ingredients consist of fatty acids, resins, surface active agents, corrosion control ingredients and viscosity adjustors.The fatty acids (oleic is the most common) act as lubricants to the ball of the pen and they also help the starting characteristics of the ball point.These pens contain a pressurized feed system instead of gravity flow.The physical characteristics of these inks are quite different from the standard glycol based ballpoint inks.Red, green, yellow and other colored chelated dyes are now used for various colored ballpoint inks.Pressurized ballpoint inks were developed about 1968.In 1946, several million Reynolds ballpoint pens reached the market in the United States.Ballpoint inks consist of synthetic dyes (sometimes carbon or graphite is also added for permanence) in various glycol solvents or benzyl alcohol.

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Some of the synthetic dyes used fade and are soluble in water.Chemical and physical analysis of inks on questioned documents provides valuable information regarding their authenticity.Comparison of these chemical and physical properties of two or more inks can determine: (1) if the inks were made by the same manufacturer; (2) in some cases, whether the inks are products of the same production batch; and (3) the first production date of the specific ink formulation involved.This explains the origin of the name blue-black fountain pen ink. This ink is insoluble in water and cannot be effectively erased by abrasion.The most popular fountain pen ink (developed in the 1950s) consists of an aqueous solution of synthetic dyes.

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