Crossword Genius

National Archives' Declaration preservative (5)

Ross

I believe the answer is:

argon

(Other definitions for argon that I've seen before include "Gas used in electric lights" , "Noble gas used in light bulbs" , "Inert gas, present in small amounts in the air" , "elementary" , "Inert gas used in light bulbs" .)

I've seen this clue in the Newsday.
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