A question about Uranium-glazed dishes.

Hi, I would like to find some uranium glazed stuff like plates, thee cups or figurines (the opaque white kind). I've never come across anything in thriftstores when I go over every shelf with white dishes or old figurines with a UV light. Is there a trick to see what stuff can have it? People who are shopping there and the people who work there all stare at me like: What are you doing with that light? I mean, I would like to be a bit more discrete. 😅