The Grey Dog’s Coffee, Ceramic Mug (New York City).
19,100 ppm lead.
Tested (in 2013) with an XRF instrument.
I used to love this thick ceramic old fashioned style coffee mug from cafes & diners! Now I am always suspicious that any mug like this is likely to be very high lead. Given the ones used in restaurants are exposed to such heavy usage (with coffee, which is also very acidic), they are also candidates for leaching (especially when they are as high lead as this example is.)
The amount of lead that is considered toxic in a modern/newly manufactured item intended for children is anything 90 ppm lead or higher. Mugs are not considered items intended for use by children and, as such, are not regulated for total lead content as detectable when tested with an XRF instrument.