Hi Barbara,
You should probably empty this artifact of its kerosene.  It is not good to have this flammable liquid in a collection item.  Anyone can do this- it is not that hazardous.  A little WD-40 sprayed around the rim area of the cap should help loosen it and if it is really stubborn- a careful use of channel-lock plyers should break it loose.
You can pour the liquid into a glass jar and drop it off at your local service station.  They should be able to add it to the oil that they save for recycling.
Hope this helps.
Sincerely,
David Ryan
Registrar
Colorado Springs Museum
www.cspm.org

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