Yixing
Good video! Machine made pots typically have thicker walls. Earlier machine pots could only make round inner wall, so people were selecting pots with corners to dodge machine pots. I think in the last couple years, machine can make pots with edges now.
What do you all think about this pot? Black Pillar (黑柱) from the early 80s or replica? It looks a bit too sandy, the color is super dark brown 

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@Bok What did you do with your pot? It may work well as a water dropper for ink calligraphy writing haha.
@steanze The clay is certainly a mystery. The clay is too sandy comparing to all of my 80s pots. The color is too dark in comparison to dark zini and not black enough for heini from the late 80s to early 90s.
@steanze The clay is certainly a mystery. The clay is too sandy comparing to all of my 80s pots. The color is too dark in comparison to dark zini and not black enough for heini from the late 80s to early 90s.
@DailyTX I sold it... that design is clearly not made with tea brewing in mind, water dripper is a good explanation and better use for it. The clay on mine was not as sandy as yours, smoother like the other 80s Zini I had to compare with. Well, I do not know much – or care, about pots of this period, a friend who knows more authenticated it for me at the time.
Nope no difference as far as i can tell...
Yea the red has a slight purple tint, almost madder brown in color... most probably a dark hongni
Thank you!
Looks like it has some Zini or otherwise darker stuff blended in, might be the lighting though. Can't be sure...