You should not store whiskey in a lead crystal decanter. While there are some gorgeous vintage decanters, the crystal is made with lead oxide in it, which can leach into your whiskey and poison you. While it’s best not to eat or drink anything served from lead crystal, acidic things, such as whiskey, will cause the lead to leach from the crystal at a faster rate. Combine that with the length of time you would typically keep your whiskey sitting in a decanter, and you’ve got a recipe for disaster.