Comparing raw and processed food: onion, illustration

Sepia ink on watercolour paper illustration comparing raw onion (left panel) to onion from an onion ring (right panel), as seen through a scanning electron microscope. Raw onion reveals a more ordered underlying structure similar to cracks or fracture lines in rocks. Onion from an onion ring no longer conforms to this pattern and instead appears solid and rough with scattered round clusters possib…