Assertion list for term "natural substance".
Results from Ascent++: 6
tattoo → MadeOf → natural substance 0.57
caffeine → IsA → natural substance 0.47
hydrogen peroxide → IsA → natural substance 0.34
caffeine (aspect of coffee) → IsA → natural substance 0.27
caffeine (aspect of tea) → IsA → natural substance 0.25
opium → IsA → natural substance 0.16