Assertion: metal's compound | /r/HasProperty | coloured
Facets:
value: often
type: TEMPORAL
Source sentences:
text: This also leads to low-lying excited states, which is probably related to the well-known fact that 3d compounds are often coloured (the light absorbed is visible).
text: There are three important characteristics of transition metals you should know about: True transition metals form coloured compounds (e.g. blue copper salt solutions) and are used in pottery glazes, stained glass and weathered copper roofs turn green!