This Lucerne Foods cookie jar/food storage container was positive for lead at the following levels when tested with an XRF instrument:
Outside Glaze: 5,441 +/- 189 ppm lead (Pb)
& 150 +/- 16 ppm cadmium (Cd).
Inside Glaze: 159 +/- 33 ppm lead (Pb).
This piece was non-detect (ND/Negative) for mercury (Hg) and arsenic (As.) Note: I don’t have information about the age/year of manufacture of this piece, but it seems to be fairly recent as there is limited cracking and crazing (and based on the style of the mark on the bottom) – likely in the past 20 years.
By modern standards, the amount of lead that is considered toxic in an item intended to be used by children is 90 ppm lead (or higher) in the glaze or coating and 100 ppm lead (or higher) in the substrate (in the case of mugs, the ceramic.)
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