He thought that some kind of impurity had undergone an exothermic reaction, so he further increased the furnace's temperature, and then the iron melted into molten iron.
But he wasn't sure.
He tried many different methods but still couldn't find the key.
However, this kind of clay was quite interesting. Besides being able to extract alkaline substances, some of its impurities could also be used to make red and blue pigments.
If you extract the bluish-green impurities and use them to paint on pottery before firing, the resulting pottery becomes very beautiful.
This could be considered a technological advancement.
This clay furnace is very impressive in terms of high-temperature resistance.
Even when the flame's temperature is at its highest, the furnace itself won't melt, and the pottery inside won't deform.
Now Ma Lin has managed to produce red and blue pottery.
They look very nice, but most of them don't measure up to porcelain.
They are pottery, not porcelain.
