All glasswork is stained with special paint that complies with the European Safety Code EN 71.3, which falls under EN 71.
EN 71 (which is a part of the CE directive) is a European Product Safety standard that applies to all toys sold in the European Union.
EN 71 has been put in place to ensure that all toys sold in the EU meet a certain minimum safety.
Of course, these glassworks are no toys but it is good to know that they meet the highest standard of safety for the entire family.