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<p>[QUOTE=&quot;desertgem, post: 2503456, member: 15199&quot;]&quot;IF the Photo is a good one (DSLR camera) and the white balance is correct my Newport spectrometer and Computer combination can detect AT from NT from the refracted light of the coin in the photo.&quot;</p><p><br /></p><p>The light coming into the focal plane image is reflected rather than refracted. If I took a &#039;perfect &#039; photo of an emerald I could not detect if it contained Vanadium, the light would have to pass through the jewel to the spectroscope.Light from stars is emitted from the star, and refracted through the spectroscope attached to the eyepiece of the telescope to indicate the star&#039;s components from spectral lines formed by the level of energy change as the electrons jump shells or quanta ranges. Perhaps if you could heat a coin to incandescence with out destroying it, you could detect the surface compositions. Jim[/QUOTE]</p><p><br /></p>

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