Dip it into water. Hold it over the spoon and ... If so, chromatography is used to reveal the dye pattern in the fragments, just like the pen ink in Yan’s note. If the dye pattern of the crime ...
Conventional dip pens typically had to be reloaded with ink by the end of each sentence. The fountain pen was invented in 1880 by an insurance salesman named Louis Edson Waterman. Before the ...
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