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The message loses credibility when it does not describe the way BPA gets into store receipts.
There are more than one type of store receipt.
Which type has the BPA problem?
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Is it the thermal printer paper that's the problem?
Or is it ink printer paper that has BPA in it?
Or is it a particular TYPE of ink with BPA in it?
What kind of receipts were used in the study?
Do they presume that readers won't be able to distinguish one type of receipt paper from another?
Yes, I understand that you are trying to determine the variables that could render an experiment invalid. However, does it really matter where the BPA is, whether it is in the ink or the thermal printer paper itself?
I understand that thermal printer paper itself might have more BPA due to the higher content of plastic in it. The thermal ink no doubt is soy-based with some plasticides in it too as plasticides are found almost everywhere today.
Thus, consumers should not be surprised to find BPA in the softer toilet papers, facial tissues such as Kleenex, and paper towels as manufacturers are adding more plastic in those products too to make them more durable. We know that BPA is present in canned foods, plastic food wraps, plastic storage bags, plastic containers, plastic dishes, and plastic water bottles. It is also used to make paper plates, cups, and bowls. And sadly, almost all children's toys made of plastic will have BPA or a dangerous substitute that is not much safer.
Bottom line: whenever I handle any kind of store receipts, they all make my fingers itch intensely.
Thus, it is good that I do not work as a cashier. Such a job could have caused serious health issues.