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<p>[QUOTE=&quot;desertgem, post: 955974, member: 15199&quot;]The faint diffraction can result from stress within the plastic. It will vary according to the intensity and &quot;purity&quot; of light striking it. Best diffraction should be from a broad spectrum source, bulb or sunlight. The stress is probably not consequential and most likely from the manufacture of the slab or the sealing process. At the molecular level, you are compressing the molecules on one side and elongating them on the other making a diffraction grating. Quite common with hard transparent plastic. IMO.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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