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 @93672b44 Take heart, the markings are typically on the outside and you can easily get ones with markings cast with the glass (though they are more difficult to read). 
 @981de366 
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. 
 @93672b44 Ah, interesting. I hadn't thought of that.