Assertion: gold | /r/HasProperty | visible
Facets:
value: to the naked eye
type: TRANSITIVE-OBJECT
value: under an electron microscope
type: LOCATION
value: readily
type: MANNER
Source sentences:
text: Because gold is readily visible under an electron microscope, scientists can now actually observe reactions in individual cells.
text: Because ore grades of 30 ppm are usually needed before gold is visible to the naked eye, in most gold mines the gold is invisible.