Assertion: newton's manuscript | /r/HasProperty | hidden in private collection
Facets:
value: for decades
type: TEMPORAL
Source sentences:
text: The manuscript, which had been hidden in a private collection for decades and turned up at an auction at Bonhams, provided the recipe for "philosophic" mercury, which was considered a step in the process for concocting a mysterious substance known the philosopher's stone; this material was thought to have supernatural powers —