Chadrinkincat wrote: ↑Fri Jan 10, 2020 4:24 pm
Youzi
Not to rehash the FB thread but would this acid washing be one factor that’s changed since 2010?
What negative effects does this process have on teapots or health? Dr. Lu has mentioned this along with BC but I haven’t come across much in-depth discussions about how it effects either.
I just double checked the sources regarding the 1980 date, which turned out to be correct, so as you pointed out (didn't know GL lasted until 86, thought its till end of 70 or 82), green label after 80s can contain barium carbonate, as 1979-1980 was the year when F1 started to add it to their clay mix. For reference please check Ben Chen's research about Yixing Chemicals, as that's the most extensive and scientific research done regarding the topic.
https://www.facebook.com/groups/2179755 ... 540322482/
Acid washing is still a thing, but mainly in lower grade teapots. The only chemical still used in higher grade teapots is low amount of Barium Carbonate. Because usually people who buy pots in that price range know the "faults" which are signs of quality clay. But they are still uneducated, and cannot accept Flower/Wind Glaze.
I'm not a chemist or a doctor so I'm not qualified to answer that. I simply do research regarding Yixing, especially modern ones, because there are too many misconceptions in the west, and over repeated false facts. While there are many experts regarding F1 period, so it didn't need another one.
I'd be more worried about the combined use of all these chemicals together and their unpredictable outcome, but I don't think they'd have too big of an effect, or anything sudden, on your health, which you could directly relate to the teapot. -- Opinion
I don't want to give opinions to people, just the facts, from which they can make their conclusions.