Assertion: coin | /r/CapableOf | tarnish to dark colour
Facets:
value: very
type: DEGREE
Source sentences:
text: In a debasement process which took effect in 1920, the silver content of all British coins was reduced from 92.5% to 50%, with a portion of the remainder consisting of manganese, which caused the coins to tarnish to a very dark colour after they had been in circulation for a significant period.
text: In 1920, the silver content of all British coins was reduced from 92.5% to 50%, with some of the remainder consisting of manganese, which caused the coins to tarnish to a very dark colour after they had been in circulation for long.