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The little bit of iron added will prevent iron deficiencies/anemia, which tea contributes to since polyphenols bind with iron in the body. It appears that tetsubin will slightly reduce astringency and bitterness, but also affect certain compounds in green tea that have health benefits. If you are dr...

https://japan-design.imazy.net/jp/crafts/azmaya/nanbu-cast-iron-kettle/ Translated from Japanese: And it seems that only "bivalent iron ion (Fe 2 +)" can be absorbed in the human intestine. Therefore, "iron ion · iron" generated by touching the southern steel bottle with water is said to be easy for...

Trying to ensure they make your tea more tasty and not less tasty.

Some good information here: http://hojotea.com/categ_e/tetsubin.htm http://hojotea.com/en/posts-61/ http://hojotea.com/en/posts-27/ There's some confusingly conflicting information on the kamayaki (activation of the iron): The first article (undated) says that this is the essential procedure to mak...

I found it interesting that he claims burning charcoal doesn't generate moisture and therefore doesn't cause rust: burning charcoal does indeed give off water vapor! From my understanding, charcoal consists essentially of pure carbon, so there is no hydrogen that would produce the water molecule. O...

Thanks Elise, I was aware of Hojo's writing on tetsubin, but was looking for solid science vs conjecture. I found it interesting that he claims burning charcoal doesn't generate moisture and therefore doesn't cause rust: burning charcoal does indeed give off water vapor!

Chiang Rai is the heart of Thai oolong country!

Hoping someone can test the ppm/L of iron contributed to tea-quality water from new and used tetsubin.

https://ratetea.com/topic/tannins-in-tea/70/ Iron binds with tannins in tea, including catechins. This means water from tetsubin may reduce astringency and bitterness while slightly reducing body. Perhaps the longer charcoal boil in cwarren's case means a higher ppm of iron? Some of the good stuff i...

So it appears iron does bind readily with polyphenols. What are polyphenols? https://en.wikipedia.org/wiki/Phenolic_content_in_tea "Polyphenols found in green tea include but are not limited to epigallocatechin gallate (EGCG), epigallocatechin, epicatechin gallate, and epicatechin." These (EGCG in p...

Canadian water filtration company and their target ranges for water pH/hardness/solutes for tea infusion:

https://danamark.com/applications/tea/

https://www.hindawi.com/journals/jfq/2017/1805047/

It appears adding iron (as ferrous sulphate) to tea causes it to bind with polyphenols, which then are excreted through the digestive tract.

Hi all, I'm interested in learning more about the effects tetsubin have on tea from a scientific perspective. I'm not interested in subjective experience based on brewing, but I'd like to know what using a tetsubin does, and why! I've tried to find some research on this and haven't found anything y...

Hi all, I'm interested in learning more about the effects tetsubin have on tea from a scientific perspective. I'm not interested in subjective experience based on brewing, but I'd like to know what using a tetsubin does, and why! I've tried to find some research on this and haven't found anything ye...

Chingwa wrote: ↑

Sat Dec 30, 2017 9:28 am

I rarely use my tetsubin...

I had to stop reading right there.

I'm concerned about forgetting about it on the stove or letting it rust!