This comes from Whisky.com Expert Blenderm:
All older lead crystal decanters have a high lead content of up to 23% and any whisk[e]y's will start to extract the lead if it's left in the decanter for any length of time, I'm talking about weeks not years. All whisky sold in decanters for the past 30+ years are sold in a style of crystal that contains no lead and is safe for use.
In the 60's and 70's there were a number of deaths from lead poisoning in the US that were caused by lead glazed pottery being brought back from Mexico. THis caused checks to be made on all possible lead contaminants and crystal was near the top of the list.
If you want to use it for show when you have guests then fill the decanter before they arrive and empty it back into the bottle after they have left.
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Jojo 
Whisky.com
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