Assertion: fountain pen's ink | /r/CapableOf | combine tannic
Facets:
value: with an iron salt
type: OTHER
value: with a blue or black dye
type: OTHER
value: with phenol
type: OTHER
Source sentences:
text: Ink today may combine tannic, Gallic and dilute hydrochloric acid with an iron salt, phenol, and a blue or black dye.