Assertion: invisible ink | /r/MadeOf | visible
Facets:
value: by someone
type: OTHER
value: by some means
type: MANNER
Source sentences:
text: Invisible ink, also known as security ink or sympathetic ink, is a substance used for writing, which is invisible either on application or soon thereafter, and can later be made visible by some means.
text: Any invisible ink can be made visible by someone who is sufficiently determined, but the limitation is generally time available and the fact that one cannot apply hours of effort to every single piece of paper.