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I’ve been sanding down a wood piece from the 1800’s. I performed two lead tests that came up negative but I’m still worried. I did the test patch by sanding it down to the bare wood, then rubbing the tester tube over the edge of the stain and the bare wood. When did they start to use lead in paints, varnishes, and stains? Does it go back as far as the 1800’s? Do I need to worry?