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A lid was also constructed to hang over the detector, reducing ambient light and allowing for viewing in normal lighting conditions. A slide demonstrating differential attenuation (for x-ray imaging this corresponds to radiodensity and is measured on the Hounsfield scale) was constructed from two filters (Congo Blue #181 and Medium Blue Green #877) and a piece of paper. Stands for the LED array, detector, and attenuation slide were constructed from acrylic. 36