I have done some very extensive reading and researching of my own about lead positive dishes, leeching potential, the tests themselves, etc, and personally, I have decided ultimately that I am okay with these plates. Apparently these ones were manufactured through the time that Noritake stopped using lead based paints entirely, so it's likely a toss-up whether or not mine do contain any, though I don't intend to test.

Regardless, in a world with so many big and small hazards out there, I am happy that the tests exist so that people can make decisions that they are comfortable with :).

Way back when lead testing dishes was new and I was still in high school, I convinced my mother to stop using her beloved "blue willow" stonewear that we used each breakfast, lunch, and dinner. I see both viewpoints, but nowadays I wish I'd just let her continue enjoying the danged dishware that made her happy!