Assertion: alloy's amount | /r/HasProperty | added
Facets:
Source sentences:
text: It is also probable that more certain results could be achieved with the use of tin, because it could be added directly to the copper in specific amounts, whereas the precise amount of arsenic being added was much harder to gauge due to the manufacturing process.
text: A small amount of nickel is added.
text: When small amounts of tin were added to make bronze you got an ax which was twice as hard and worked well.