These are the preferred type for beginning or young collectors. Always provide adult supervision when charging collecting jars.
Glass jars with white metal caps have a layer of porous plaster poured on the jar bottom. They are shipped without being charged to allow shipment through the mail.
Ethyl acetate is a commonly used killing agent. To prepare for use, pour about 1 oz. of ethyl acetate into jar, screw on lid and wait 20 minutes until plaster is fully saturated.
Then, using a funnel, pour any liquid remaining on the surface back into the container of ethyl acetate. Recharge jars as needed.
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