Holy crap i startet watching this anime cause i was doing stuff like primitive technology for like 9 months and people kept referencing it and ITS SO ACCURATE TO REAL LIFE Holy crap legit 1:1 Best freaking anime i have seen ...Il also predict the Old man in the Opening whos muscular is a Glass Maker

Atleast it looked like he Used a Pipe too blow the Glass Mix and if they go super Wikipedia info its gonna be Typical Sand/ Lime / Pottasium or Sodium stuff, ones for Making it Soft and other for lowering the melting point but both do that i didnt see anything else.... And he was carrying it Up not down for air in a forge or idk im at episode 7 gonna binge watch all

And Sanku used the the Coil pottery method you can see those Layers telling you how he did it and Pyrite can be white too and it does make sparks but so Can Other Minerals especialy in methamorphic rocks

Anyway heres just a few pics of my progress and facts cause idk ... Made a bit of Iron from a mud furnace and Basicly iron rust ore , i would have used the pyrite if it wouldnt be soo beautyfull ( find in Calcite Veins pyrite or around )

My Third firing and like +2 pots ever that i made in next

In the Green Clay + Dirt you can just put dirt in a hole and put water and let the Clay ( cant feel , cant see whit naked eye ) Particles flow too the next and you get pure clay or Purer

And next is Pyrite thats White inside its a bit yellowish

Last pic is Yellow - Iron whit water basicly Red is alot of oxygen Theres black also Low Oxygen And the Blue one i think its Phosphorus Theres also Purple and Green , and Blue Iron , only kniw of Blue wustite or magnetite ( low oxygen stuff ) if i can post pics of it in comments i will i have purple and blue

And the Last pic is 750-800C the Color of the Fire tells you its temperature i was firing a pot also 2 air entrys in the back like a V Help a ton

I did ALOT other things and yeah Dr stone has my respect its VERY ACCURATE and funny as fuck time too binge watch