Test results for “Matte Black” finished metal Liberty brand cabinet knob / “Bar Knob” purchased summer 2022 at Home Depot

Reading #1) Test on the Knob

• Lead (Pb): 192 +/- 28 ppm
• Tin (Sn): 100 +/- 16 ppm
• Barium (Ba): 3,568 +/- 160 ppm
• Chromium (Cr): 2,371 +/- 733 ppm
• Copper (Cu): 5,991 +/- 286 ppm
• Zinc (Zn): 3,831 +/- 184 ppm
• Manganese (Mn): 3,471 +/- 459 ppm
• Titanium (Ti): 123,900 +/- 4,300 ppm
• Zirconium (Zr): 256 +/- 18 ppm
• Iron (Fe): 1,454 +/- 240 ppm
• Vanadium (V): 40,400 +/- 2,100 ppm
• Platinum (Pt): 155 +/- 70 ppm
• No other metals detected in consumer good mode

Reading #2) Test on the back screw (included in package)

• Cadmium (Cd): 1,105 +/- 83 ppm
• Chromium (Cr): 907 +/- 223 ppm
• Iron (Fe): 834,600 +/- 2,300 ppm
• Zinc (Zn): 153,900 +/- 2,100 ppm
• Manganese (Mn): 3,258 +/- 453 ppm
• Palladium (Pd): 1,084 +/- 81 ppm
• Silver (Ag): 1,716 +/- 99 ppm
• Indium (In): 356 +/- 63 ppm
• Tin (Sn): 264 +/- 63 ppm
• No other metals detected in consumer goods mode.

For those new to this website
Background updated September 2022:

Tamara Rubin is a Federal-award-winning independent advocate for consumer goods safety and a documentary filmmaker. She is also a mother of Lead-poisoned children. Tamara’s sons were acutely Lead-poisoned in August of 2005. She began testing consumer goods for toxicants in 2009 and was the parent-advocate responsible for finding Lead in the popular fidget spinner toys in 2017. Her work was also responsible for two CPSC product recalls in the summer of 2022, the Jumping Jumperoo recall (June 2022) and the Lead painted NUK baby bottle recall (July 2022) and was featured in an NPR story about Lead in consumer goods in August of 2022. Tamara uses XRF testing (a scientific method used by the U.S. Consumer Product Safety Commission) to test consumer goods for toxicants (specifically heavy metals), including Lead, Cadmium, Mercury, Antimony, and Arsenic. All test results reported on this website are science-based, accurate, and replicable. Items are tested multiple times, to confirm the test results for each component tested and reported on. Please click through to this link to learn more about the testing methodology used for the test results discussed and reported on this website.