[gatewood]

I wish to know about a reaction between vegetable oil and table salt:

https://m.youtube.com/watch?v=1DENXNWGcKE

What the guu basically does is cover the pan with oil, sprinkle it with table salt and fire it. Ive done a similar procedure (lots of smoke! Do it outside) and the pan does indeed end up with a black lining, similar to the glazing in pottery.

So my question is this, what reaction is happening there? Is sodium chloride reacting and becoming something like sodium carbonate?

P.D: in my experiment, I used bigger grains of salt and ended up with very square (with perfect 90° edges) crystals, some even fractalized.

[Enthalpy]

Maybe the salt corrodes the pan's aluminium, helping char to adhere.

It sounds like a very bad idea to me to destroy Ptfe by heat and then put food in contact with the pan. All fluorinated polymers produce badly toxic compounds by decomposition.

Oil too makes some toxic compounds by pyrolysis, like about any substance.

My recommendation is: don't do this.

[Mitch]

I don't see how PTFE can be repaired by the procedures shown in that video without either creating something toxic or just corroding all the PTFE off the pan.

[Enthalpy]

The proposal is to replace (part of) the Ptfe by some oil char, said to be anti-adhesive too.

Destroying Ptfe by heat near living creatures is a bad idea, eating then from the pan is even worse.