JMO8778,
Well cellulose is a birefringement material, or bi-refractive, e.g. it splits light into directions with different velocities.
What is curious, is its likely that Coroner Meyer had access to, or used, a polarized light microscope, otherwise he could not have stated the sample was birefringement material. So you would expect some comparison to be done on the other pieces of paintbrush to confirm if this was the source?
Also that Steve Thomas does not tell us that there is no missing piece, or that the paintbrush used had signs of been broken before, suggests to me that this is relevant, in fact Steve Thomas in his book offers minimal information, and glides past this subject quickly.
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I think Dr. Meyer used "birefringent" to describe a shiny, reflective bit of matter. Since his job was to recover evidence from the body and give an official judgment on mode and manner of death, I don't think we can assume he made the official determination about what the minute matter was. I speculate that protocol called for minute physical evidence be sent to criminologists for an official determination and they made a separate report.
I've heard "splinter" and "cellulose" used by various people though I haven't seen anything that states either term meant the birefringent material found by the medical examiner. It seems to be a debatable point. :waitasec:
At the time Steve Thomas wrote his book I don't think he knew if there was a missing piece or not. It is missing as far as we know but only important if it was used to molest JonBenet or if it would eventually be found in possession of the killer. I can't see a killer taking the end piece and leaving the other two pieces at the scene. There were too many personal items on JonBenet that, in my opinion, could have been taken as a trophy, such as her necklace and/or bracelet. I speculate the necklace would have been the trophy of choice since the killer used ligature strangulation. However, if one believes a trophy was taken, in my mind, that eliminates a small foreign faction killing for revenge on John -- they aren't interested in trophies.