When tested with an XRF instrument the brown glass of this Mountain Rose Herbs bottle had the following readings (these readings are typical for brown glass & you can see more examples HERE.) If a metal is not noted in the result set below it was not detectable by the XRF in the particular test done.
Reading #1 (on side of bottle)
(each reading done for a minimum of 60 seconds, with a freshly calibrated instrument)
- Lead (Pb): 80 +/- 13 ppm
- Barium (Ba): 18,500 +/- 400 ppm
- Iron (Fe): 2,153 +/- 120 ppm
- Bismuth (Bi): 21 +/- 12 ppm
Reading #2 (on side of bottle)
- Lead (Pb): 81 +/- 13 ppm
- Barium (Ba): 16,700 +/- 400 ppm
- Chromium (Cr): 186 +/- 117 ppm
- Iron (Fe): 2,199 +/- 119 ppm
Reading #3 (on rounded edge of top of bottle)
- Lead (Pb): 112 +/- 17 ppm
- Barium (Ba): 2,061 +/- 89 ppm
- Zinc (Zn): 47 +/- 19 ppm
- Iron (Fe): 3,531 +/- 280 ppm
- Bismuth (Bi): 24 +/- 11 ppm
- Vanadium (V): 822 +/- 70 ppm
- Titanium (Ti): 1,714 +/- 123 ppm
It is possible to have Lead-free brown glass – here’s a link to a good example of that.
This low level of Lead is probably/possibly not leaching from the bottle under normal circumstances, however I don’t know that the specific concern has been studied when looking at contents including citrus based essential oils.
In my opinion I think the concern merits further study and in the absence of further study it would be great to see these companies switch to Lead-free colored glass alternatives which is consistent with their overall stand about health and the environment. [I understand – from talking to folks who sell these products – that the color of the glass is important to protect the contents from deterioration with exposure to light.]
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As always, please let me know if you have any questions.