Here is one good source for food grade lye that is used for home curing of fresh green olives (which we offer in season.) Be sure to follow directions on safe handling. Duda’s Red Hot Devil Lye, 99+% Pure Sodium Hydroxide / Caustic Soda Beads Food Grade: Meets the specifications of the Food Chemicals Codex, Made in the USA http://www.dudadiesel.com/choose_item.php?id=2drhdl&gclid=CNvGhu6UicECFQET7AodK24AuA#sthash.PpaoeDsg.dpuf – See more

at: http://greatolives.com/penna-blog/food-grade-lye-for-curing-fresh-green-olives-2/#sthash.9r9v2C55.dpuf