Yi xing thrift store score??

[Bok]

Black Bone Syndrome; Why inside clay dark and outside exposed clay red?... Interesting. Must have to do with type of clay used.

As far as I have understood it, the iron content of the clay(so usually hongni and Zhuni, although it does exist with Zini as well) turns black at very high sustained temperatures. It also becomes magnetic to give you an idea of the iron content!

It is usually not the whole pot thought, just locally. Also this kind of pots normally excell at making tea. I have two and both are marvellous with any tea.

[Bok]

Another one with black bone:

[Victoria]

Black Bone Syndrome @Bok I’ve only had a sprinkling of black chips along clay in my yixing pots and Japanese kyusu. So, it seems, these BBS pots have larger excess iron areas in clay.

[Bok]

Black Bone Syndrome Bok I’ve only had a sprinkling of black chips along clay in my yixing pots and Japanese kyusu. So, it seems, these BBS pots have larger excess iron areas in clay.

Also it seems that only happened in the old wood kilns. Never seen afterwards in the modern era.

[Victoria]

Black Bone Syndrome Bok I’ve only had a sprinkling of black chips along clay in my yixing pots and Japanese kyusu. So, it seems, these BBS pots have larger excess iron areas in clay.

Also it seems that only happened in the old wood kilns. Never seen afterwards in the modern era.

Too much iron is not good for tea so...

[Bok]

@Victoria don’t think that iron leeches into the tea from these pots as it would from a Tetsubin for example.

I think why these pots excell with tea has more to do with heat retention properties. Also they are usually very thin walled.

Not seen afterwards as the exact firing conditions that lead to it can not be replicated with modern kilns.

[Chadrinkincat]

Kyarazen discusses BBS in this thread. Combo of oxidation and reduction firing. Modern kiln is only oxidation.

https://www.teachat.com/viewtopic.php?t=20655&start=60