nostr:npub1nqw7xe4nk74au74fy3qjwj8yh5e6gndm3mz8t04ev9ngpncay9xquumelw 
If you're washing them in the same water as other dishes (like a dishwasher), lead and the like is going to leach onto other surfaces. I'll be replacing mine with ones that have the markings cast into the glass.