Assertion: formaldehyde | /r/ObjectUse | used for tanning
Facets:
value: in the past
type: TEMPORAL
Source sentences:
text: Formaldehyde has been used for tanning in the past; it is being phased out due to danger to workers and sensitivity of many people to formaldehyde.
text: Formaldehyde has been used for tanning in the past; it is being phased out due to danger to workers and sensitivity of many people to formaldehyde.