Marble King

Green shooter marble (Marble King brand, previously sold & marketed as Lead-free): 1,375 ppm Lead (+ Cadmium too).

Green shooter marble (Marble King brand, previously sold & marketed as Lead-free): 1,375 ppm Lead (+ Cadmium too).

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Above photos shows a small Marble King brand green-swirl “cat’s eye” marble (randomly positive for 175 ppm Lead) next to a large Marble King brand green-swirl “cat’s eye” shooter (randomly positive for 1375 ppm Lead). Please note the level of Lead is not dependent on the size of the marble. – Photos by Avi B….

Things we’ve accomplished together (me + you, my readers) & why I still need your support. #SmallVictories #BigVictories

Things we’ve accomplished together (me + you, my readers) & why I still need your support. #SmallVictories #BigVictories

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Did you know Marble King removed the “Lead-free” labeling from their website and packaging as a result of this work? Are you in a position to help keep me doing what I do? (Everything I do is with the support and involvement of my readers!) Below is just one example of how – together –…

Avi’s 8th Grade Science Class Experiment: “How does the elemental composition of glass marbles affect their color?”

Avi’s 8th Grade Science Class Experiment: “How does the elemental composition of glass marbles affect their color?”

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Photos by Avi B. Rubin, age 14 (8th grade science, Sellwood Middle School) Below each marble image is the full XRF test result for that particular color (& style) marble. These marbles are all from the manufacturer Marble King. Important points to note: A Niton XL3T XRF instrument was used for this testing. All testing…