X-ray permeability of different materials

X-ray image of different organic and inorganic materials by the photochemists Joseph Maria Eder and Eduard Valenta. 1. silver (0.1-0.2 mm) 2. copper (0.1-0.2 mm) 3. magnesium 0.1-0.5 mm) 4. lead (0.1-0.2 mm) 5. tin (0.1-1 mm) 6. zinc (0.5 mm) 7. clear quartz (1 mm) 8. clear quartz (1 cm) 9. aluminium (0.1 - 1cm) 10. platinum (0.1-0.2 mm) 11. flint-glass (1 mm) 12. flint-glass (1 cm) 13. pear wood ( 0.1 -1cm) 14. crown-glass (1 mm) 15. crown-glass (1 cm) 16. conifer wood ( 0.1 - 1 cm) 17. nacre (1 mm) 18. bone (1 mm) 19. horn (5 mm) 20. rubber (1 cm) 21. wax ( 1cm) 22. flesh (1cm) 23. celluloid (0.3 mm) 24. mica (0.1 mm) 25. morocco leather (1 mm) 26. woolen cloth (5 mm) 27. fourfold dressing material