When tested with an XRF instrument, the electrical cord on the vintage (c. 1970s) Lite-Brite pictured here was positive for 21,900 parts per million (ppm) Lead. [The hard plastic in the unit itself was negative for lead.]
The amount of lead that is considered unsafe in modern / newly manufactured items intended for children is anything 90 ppm lead or higher. For more info about XRF testing and about lead in consumer goods click here.
In general I recommend avoiding vintage toys, however with this item it would be fairly easy to replace the vintage electrical cord and have a lead-safe toy.
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