Thanks.
In order what I did before seasoning was
>boiled some water with the cast exactly as it looks in the op
>rinsed scouring shit with steel whool
>on the fire for drying it
>another scrub also with a pinch of baking soda
>rinsed and again on fire for drying it
>as the black areas on the surface weren't going away (the scrub was uneffective because nothing happened besides the area getting light coloured) I gave up and oiled the entire dry pan
>next morning (today) did the last try using a very little bit of dish soap, just to try all the solutions, and scoured with the hard face of the sponge: nothing happened besides black water.
>dried on fire and covered in oil the seasoned as described
Will repeat tomorrow because the entire process did a lot of shit smell in my house lol.
For the use and care I know the basis, this accident was not programmed...I'm sure the fucking flour before putting the dough fucked up everything, also when the pan was in the oven it went worse.
I'm "glad" it happened because now I know how to fix it, I hope.
I'm not retarded as some of you may think, it's just that in my entire life I've never used a pan like this, not even my family, friends ecc.
as I said, in Italy this is some "exotic" stuff mostly used by cooking enthusiasts, so that's why I'm here asking for informations rather than asking my mother or some relative.