Thx for the advice. But you're writing to someone who makes soap with
its frying oil. So I know what being careful means with corosif products ;-)

Anyway, I think there might be a weaker calcium hydroxide.
I found again the recipe:http://www.kimkins.com/how-to-make-y...ataki-noodles/


PS: if one wonders about the smell of the deep-fry-oil-made soap It's
not so good. Between smell of nothing and the smell of what it is. But
it make funky soaps for hand wash.

Not sure about the noodles but I also make soap and use the same lye
(sodium hydroxide) to make hominy. It is also used in several food
making procedures including Chinese noodles:
http://en.wikipedia.org/wiki/Sodium_hydroxide
The trick is careful use, eye coverage and washing and rewashing and
rewashing the finished product. Also keep a spray bottle of vinegar
nearby. I always get stinging wrists from forgetting and resting them
on the edge of my soap vat. Quick squirts of vinegar immediately stops
the sting and neutralizes the lye.

I grew up saving cooking oils for my grandmother to make soap and
still do the same myself. Strain the oil through cheesecloth - a
couple of passes will usually leave you with nearly clear see through
oil and much of the scent gone. We also add borax and baking soda to
use them for laundry soaps. Borax whitens and cleans, baking soda
deodorizes.I use one to two cups of each for every 5 lbs of fat/oil.

BTW you can use the soap to clean the cheesecloth and re-use it