Fruit always looks delicious even if it's sliced, chopped, crushed or otherwise mangled, and watching someone cut a piece of fruit tends to make my mouth water.
But it turns out color has a lot to do with produce appeal, and when a piece of fruit is sliced open to reveal flesh that's a different color than expected it triggers our WTF response rather than our salivary glands.
For this UV video, the subject is illuminated directly by UV emitting lamps . UV filter is placed on the lens, which allows ultraviolet light to pass and which absorbs or blocks all visible and infrared light. UV filters are made from special colored glass and may be coated or sandwiched with other filter glass to aid in blocking unwanted wavelengths.
-Via Laughing Squid
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