Assertion: hydrogen's color | /r/HasProperty | due
Facets:
value: to metal sulfides
type: CAUSE
value: to rayleigh scattering of blue light
type: CAUSE
Source sentences:
text: Sludge from a pond; the black color is due to metal sulfides
text: Sludge from a pond; the black color is due to metal sulfides
text: 2 are clear substances with a light sky-blue color caused by absorption in the red (in contrast with the blue color of the sky, which is due to Rayleigh scattering of blue light).