Assertion: mirror | /r/HasProperty | produced
Facets:
value: usually
type: DEGREE
value: fully
type: MANNER
value: by applying a reflective coating
type: MANNER
value: often
type: TEMPORAL
value: nowadays
type: TEMPORAL
Source sentences:
text: Nowadays, mirrors are often produced by sputtering a thin layer of molten aluminum or silver onto the back of a plate of glass in a vacuum.
text: Note that to protect the mirrors during assembly, they were fitted with lightweight, black covers, which were removed once the mirror was fully assembled.
text: Mirrors are usually manufactured by either polishing a naturally reflective material, such as speculum metal, or by applying a reflective coating to a suitable polished substrate.