As someone who's been happily vegetarian since 1988, and someone who likes to experiment with new foods and ingredients, I had made a fabulous food find.
I first encountered yuba (bean curd skin) in a Chinese restaurant dish and found it plenty of tasty. Delicate and tender with just a bit of chew and a nuttiness that partnered perfectly with seasonings and sauces. I was intrigued by this ingredient (it is the protein layer that forms on heated soymilk) and wanted to buy it to use in my home kitchen, mainly for chili, bbq, curried dishes, and buffalo-seasoned dishes.
I ordered a package of dried bean curd sticks (Dragon brand, distributed by Well Luck Co.) and when they arrived, I was about to take one out of the package and reconstitute it when I saw the ingredients. WATER, SOYBEANS, SODIUM HYPOSULFITE (FOOD ADDITIVE)
Sodium hyposulfite is another name for sodium thiosulfate, which is used as a medicine, a foot bath treatment to prevent fungus, a photographic fixer, to tan leather, and to extract gold from rocks, among other uses, and NOWHERE IS IT MENTIONED THAT IT IS USED IN FOOD, so I am assuming that this chemical is NOT approved for or suitable for food use.
The yuba sticks went right in the trash, because no way was I consuming anything containing an additive like that.
WHY WOULD A MANUFACTURER PUT AN INEDIBLE THING IN SOMETHING THAT IS SUPPOSED TO BE FOOD?