on the electric blanket remains unidentified. investigators found no evidence that judy bruce and james isaac were anything more than acquaintances. next, investigators asked dick bisbing, senior researcher at mccrone associates, to analyze the dirt on the bottom of larry bruce s shoes which were still in evidence. to do this, bisbing used a polarized light microscope. it s like looking through polarized sunglasses and by manipulating the light we can see different optical properties, different optical features of each of these mineral grains. their appearance, their color, their optical properties all help us identify the type of mineral. the dirt on larry s shoes did not match the samples of dirt around judy s body. but the polarized light revealed an important, previously undetected clue these brightly colored minerals.
there wasn t really much else to take. bill schneck took paint samples from the boot and the car and placed them on slides with an immersion liquid. this eliminated any air trapped between the sample and the slide. using a polarizing light microscope magnified up to 1,000 times, schneck saw the paint was a lead chromate paint. and i contacted the national institute of science and technology and received a paint chip known standard on a 74 camaro. using a scanning electron microscope, schneck now did a three-way comparison. he examined paint from the boot, from the car, and from the file sample of a 1974 camaro. all were identical. and with this evidence, dale bradley was arrested and charged with bryan ruff s murder.
next, investigators asked dick bisbing, senior researcher at mccrone associates, to analyze the dirt on the bottom of larry bruce s shoes which were still in evidence. to do this, bisbing used a polarized light microscope. it s like looking through polarized sunglasses and by manipulating the light we can see different optical properties, different optical features of each of these mineral grains. their appearance, their color, their optical properties all help us identify the type of mineral. the dirt on larry s shoes did not match the samples of dirt around judy s body. but the polarized light revealed an important, previously undetected clue these brightly colored minerals. the soil from the shoes contained calcite, which is
there wasn t really much else to take. bill schneck took paint samples from the boot and the car and placed them on slides with an immersion liquid. this eliminated any air trapped between the sample and the slide. using a polarizing light microscope magnified up to 1,000 times, schneck saw the paint was a lead chromate paint. and i contacted the national institute of science and technology and received a paint chip known standard on a 74 camaro. using a scanning electron microscope, schneck now did a three-way comparison. he examined paint from the boot, from the car, and from the file sample of a 1974 camaro. all were identical. and with this evidence, dale bradley was arrested and charged with bryan ruff s murder.
mccrone associates, to analyze the dirt on the bottom of larry bruce s shoes which were still in evidence. to do this, bisbing used a polarized light microscope. it s like looking through polarized sunglasses and by manipulating the light we can see different optical properties, different optical features of each of these mineral grains. their appearance, their color, their optical properties all help us identify the type of mineral. the dirt on larry s shoes did not match the samples of dirt around judy s body. but the polarized light revealed an important, previously undetected clue these brightly colored minerals. the soil from the shoes contained cal site, calcium carbon night, could be from limestone, and that type of material is often used in