Your grandmother had these, didn’t she?
These butterfly pattern vintage “Corelle by Corning” (Made in New York) bowls tested positive for lead at 23,300 ppm when tested with an XRF instrument.
The amount of lead that is considered toxic in an item intended for children (when tested with an XRF instrument) is anything 90 ppm lead or higher in the coating. There is no regulation limiting the total lead content in dishware as detectable with an XRF instrument. Modern dishware regulations focus on leach testing and other measures of toxicity, not XRF testing – yet. Antiques and vintage items were also generally not regulated (if regulated at all) to any levels that could be considered protective of consumers’ health using modern scientific standards.
A goal for my advocacy is that all dishware be required to test negative for lead by any and all testing methodologies, including XRF testing. If a toy is considered toxic for a child using one testing methodology (within a certain range: 90 ppm and above), why is that testing methodology and standard not used across the board for all consumer goods, especially dishware, which is used by humans of all ages and used across generations?
Every version of this “Butterfly” pattern that I have tested is either very high lead OR very high cadmium (which is also toxic/carcinogenic!) I personally would not use this type of decorated dish in my home and would prefer not to use it if I was visiting your home. [Keep some paper plates on hand in case I come visit!]
Do you want to find a modern lead-free Corelle pattern that is suitable and safe for you to hand down to YOUR grandkids? Check out these (they are my favorite lead-free option on Amazon!)*