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<p>[QUOTE=&quot;-jeffB, post: 1665887, member: 27832&quot;]I&#039;m pretty sure that actual UV has nothing to do with bringing out toning color. As far as I know, none of the simple metal salts responsible for toning are fluorescent. Cameras without UV filters have some sensitivity to UV wavelengths, but if anything that would make the resulting image <i>less</i> realistic (because your eyes won&#039;t perceive those colors), and less sharp (because the UV won&#039;t be focused as sharply as the visible wavelengths).</p><p><br /></p><p>I would definitely expect sunlight to provide better results than other light sources. The colors from toning result at least in part from interference effects, and as a result they represent pure colors, not the mixtures of red/green/blue that you see on a computer or TV screen. If your light source (say, a CFL or LED bulb) doesn&#039;t produce a smooth spectrum, it will produce smaller amounts of some colors and larger amounts of others. So, for example, a coin might show a smooth shading from blue through yellow under sunlight, but it might show bands of bright blue-green and yellow separated by dark bands under CFL light.</p><p><br /></p><p>I&#039;m a huge fan of LED lighting in general, but for shooting toned coins, it&#039;s probably not the best choice. Today&#039;s LED bulbs have a big spike in the blue spectrum, a pronounced valley in the blue-green range, and then a smooth curve peaking in greenish-yellow/yellow/orange. It looks fine for most things, and it&#039;s probably better than most CFLs, but it&#039;s not going to produce the same results as a halogen bulb or sunlight.[/QUOTE]</p><p><br /></p>

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