This Hasami Porcelain ceramic mug (Made In Japan) was negative (non-detect/ND) for Lead (Pb), Mercury (Hg), Cadmium (Cd) and Arsenic (As) on the glazed elements when tested with an XRF instrument.
Other elements found in the glaze:
- Zinc (Zn): 2,480 +/- 114 ppm
- Iron (Fe): 4,174 +/- 288 ppm
- Bismuth (Bi): 24 +/- 11 ppm
- Titanium (Ti): 380 +/- 139 ppm
- Platium (Pt): 103 +/- 51 ppm
When testing the unglazed bottom, the base clay was positive for the following metals:
- Lead (Pb): 30 +/- 11 ppm
- Chromium (Cr): 2,284 +/- 108 ppm
- Zinc (Zn): 118 +/- 24 ppm
- Iron (Fe): 20,800 +/- 800 ppm
- Bismuth (Bi): 44 +/- 12 ppm
- Vanadmium (V): 196 +/- 35 ppm
- Titanium (Ti): 1,661 +/- 100 ppm
- Magnesium (Mn): 1,850 +/- 297 ppm
This level of lead is considered safe by all standards.
See more mugs I have tested here.
Here is an Amazon affiliate link* to a similar mug from this company.
As always, please let me know if you have any questions!
did you test the glazed part as well as the rim, where it is unglazed with a rough texture/where you put your lips?
Post updated. The rim was “ND”, negative for lead, but the surface of the rim is much smaller than the detection window, so while the bare edge/rim was negative, the reading on the bottom of the cup (which is a contiguous surface that fills the entire scope area of the XRF made of the same material as the rim, the base-clay of the cup) was positive for a very low level of lead.
Kristin Johnson says
You’re making me want to go mug shopping. I hate shopping. I love mugs.
New mug post (two tonight actually!) https://tamararubin.com/2018/12/hearth-hand-by-chip-joanna-gaines-green-gold-mug-117-ppm-lead/
Thank you all that you do to keep families safe. I just found your site and I am new to the science of lead safety. I use Hasami Procelain mugs every morning for espresso, but I use the natural ones (no glaze). Are these safe even with this level of Lead (Pb): 30 +/- 11 ppm? Thank you!
Hi, I use the unglazed version of these Hasami mugs too (and plates and bowls).
Do you mind testing those “natural” version, or weighing in on low lead content you’ve discovered on the bottom?
Thank you for all the work that you do! It’s truly been so helpful! Would you personally consider Lead (Pb): 30 +/- 11 ppm at a safe level? Knowing the unglazed bottom of the mug tested positive, I’ve been hesitant to purchase the natural unglazed Hasami Porcelain mugs.
Amy Stephan says
I agree… love those hasami products, especially the unglazed ones, but worried about the lead…. any lead level. My understanding is that there is no safe level of lead. I think that came from American Academy of Pediatrics, but have to check.
I use hasami for everything
is it safe?
water tea food etc