Knowra Walter McCrone Walter McCrone Walter McCrone (1916–2002) was an American microscopist and forensic scientist who used microscopy and microanalysis to examine disputed artifacts, artworks, and criminal evidence.
Shroud of Turin : A linen cloth bearing an image of a man, traditionally identified by some Christians as Jesus’s burial shroud. McCrone concluded that its image pigments were applied with a brush, contrary to claims of a miraculous image.
Microscopy : The use of microscopes to observe structures too small to see clearly with the unaided eye. It was the foundational means by which McCrone examined fibers, pigments, and other trace materials.
McCrone Associates : A microscopy and microanalysis laboratory founded by Walter McCrone in Chicago. The firm carried out his consulting work on forensic evidence and disputed objects.
Radiocarbon dating : A method for estimating the age of once-living material by measuring radioactive carbon-14 decay. Unlike McCrone’s particle analysis, it dates organic material rather than identifying pigments.
Vinland Map : A purported medieval map depicting lands west of Greenland, now widely regarded as a modern forgery. McCrone’s analysis found modern anatase pigment in its ink, evidence against medieval origin.
Polarized light microscopy : Microscopy that uses polarized light to reveal optical properties of transparent materials. McCrone used it to distinguish pigment particles and identify crystalline materials.
McCrone Research Institute : A Chicago nonprofit organization devoted to microscopy education and research, founded by Walter McCrone. McCrone established the institute to teach microscopy and support scientific research.
Provenance : The documented history of an object’s ownership, custody, and location. Documentary history can support or challenge an authenticity judgment independently of laboratory analysis.
Vinland Map controversy : The scholarly dispute over the Vinland Map’s authenticity, dating, and provenance. McCrone’s pigment findings became a central scientific argument in this authenticity dispute.
Electron microscopy : Microscopy that forms images using a beam of electrons rather than visible light. It enabled examination of particle shapes and surfaces beyond ordinary optical resolution.
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