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Assuming I understand the situation, it may be similar to red sky at night. It would look lighter around the edges because the back light has less total food coloring to filter through. Where you are looking through a chord of the glass at 5 deg arc the light is only having to pass through very little food coloring. When passing through the chord closer to 180 deg it has to travel through the full diameter of coloring.
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-Blind faith runs into things!-
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