Yes, a nail polish bottle is a structure. Any constructed object
is a structure.
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Yes, the solvent of the polish will evaporate when the lid is
off the bottle.
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Nail polish will start to separate after about 6 months to 1
year in the bottle. Clinique nail polish can be kept for the same
time frame and after about a year it should be tossed out for a new
bottle.
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who cares just polish your toenails! Sometimes you can read the
back of the nail polish bottle to figure it out. POLISH