Dried Blood Spot Testing
104 стр. мягкая обложка
978-6-1325-6411-5

A microscopic exam revealed that the "dried blood" on Ripper letters is consistent with the oil-and-wax mixtures used in etching ground, and under ultraviolet light it fluoresced milky white, which is also consistent with etching ground. Art experts say that sketches in Ripper letters are professional and are consistent with Walter Sickert's art works and technique. As an interesting aside, a blood-detection test conducted on the blood-like etching ground smeared and painted on Ripper letters came up as inconclusive - which is very unusual. Two possible explanations are as follows: It could be a reaction to microscopic particles of copper, since in this type of testing copper could cause inconclusive results or a false positive; or it could be the presence of blood mixed with the brown etching ground. Handwriting quirks and the position of the Ripper's hand when he wrote his taunting, violent letters lurk in other Ripper writings that are disguised. These same quirks and hand positions lurk in Sickert's erratic handwriting as well ...