Dating paper ink
If the paper is non-uniform in its absorption on the surface, the first down ink will build tack non-uniformly, and will trap the second ink unevenly.This mottle is rated visually from a “1” being the best to a “5” being poor. Download here Solid prints are made at a controlled ink film thickness of .05 mils, with temperature neutral ink. This temperature is reported as the maximum temperature that the paper can achieve without blistering. Download here Gloss can be measured at 20, 60, or 75 degrees.We can always have some indication of a starting date for a technique if we can find who first put the idea into practice.
Over time, this generates a setting curve, and the slope of this curve is reported as the rate at which the ink and paper combination “set”.Acceptance often occurred over a period of many years or decades in some cases.This technology lag makes some diagnostic characteristics better than others for dating. As a corollary to #1, consider the following quote: "Treat terminal dates with care.If the ink contains heavy oxidation-type oils, it sets slowly.
If the ink is formulated with hydrocarbon oils, it will be fast setting.
He began his career in 1975 as a forensic chemist for the U. Treasury Department, Bureau of Alcohol, Tobacco and Firearms, National Laboratory Center in Rockville, Maryland, where he engaged in consultation, examination, training, research and testimony as service to federal and state law enforcement.