Slice of English cucumber when exposed to regular daylight ...

The image is composed of two parts: an upper half showing an ordinary cucumber slice and a lower half with the same cucumber slice under UV light.

The top part shows a plain slice of green cucumber, which is common to see at supermarkets. The bottom part displays the same cucumber, but now illuminated by UV-A blacklight from a supermarket. This UV light causes the cucumber to fluoresce blue and red, making its interior visible as if it were transparent. The fluorescent areas are particularly noticeable around the seeds in the center of the cucumber.

The image highlights that cucumbers contain chlorophyll and other pigments, which can be made visible by exposing them to ultraviolet light at a wavelength of 365 nm. This phenomenon is known as fluorescence. When illuminated by UV-A blacklight, these pigments emit light at specific wavelengths, causing the cucumber to glow in blue and red colors.

Overall, this image demonstrates how UV-A blacklight can reveal hidden details in everyday objects, such as the interior structure of a cucumber slice. – AI vision