Vintage Book: Come to The Farm, 1949

Vintage book, circa 1949, used in a library through 1962. XRF readings for lead were between 700 and 1400 ppm (pages and covers). The amount of lead that is considered unsafe for children in a newer item manufactured and sold today is 90 ppm lead or higher. This reading was done with a Niton XRF instrument — by an operator who is trained and certified in using the instrument.

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