Sorry that is a bunch of new age pseudoscience crap. She starts by saying bacon fat, lard, olive oil, peanut oil is wrong and won’t properly season cast iron that only flax seed oil will work properly. So my grandmother, mother and I have not properly seasoned a cast iron pan in the last 100 years? I’ll bet 9 out of 10 people here did not season their cast iron with flax seed oil either.
She also says that modern pork is bad, but pork from years ago when the pigs chased the buzzards off so they could eat dead stuff, and other animals shit was healthier!?!?!
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+1 on this!
Truthfully, I collect both Griswold and some Wagner. I have used both Crisco and Bacon grease for years, as that's what I learned as a kid (I'm 64). It has worked fine for many years for my stuff. It think the Flaxseed stuff actually glazes the items much like a varnish, that doesn't readily burn. Probably good for the newer junk cast iron that's out there! But the old stuff doesn't need a glaze coating, just a good cooking oil type finish.
In fact, when I season mine, I clean it first with an Electrolysis bath, then I heat it on the gas grill (lid down)at the max setting for 45 minutes to an hour. Then I remove it (with pads)while it's hot and the metal pores are open, then I coat it with Crisco or Bacon grease. It's worked great for all my stuff for many many years.
One very important thing though, is to never never use soapy water to clean cast! That will ruin it worse than anything! Just very hot water and coarse steel wool is the best ticket!