I really hope that anyone using spider silk really advertise it, in big letters, so that people are aware. I would throw up for days in a row if I got to know that a soap that I have bought AND used did contain spider silk. I would also take a shower in pure bleach and other chemicals to get it all off. I could not even read the comments on this thread, only a few, because I felt sick already just by the thinking of it. Who on earth could possibly want to use the worst creature on earth to make soap? Maybe I am too afraid of spiders. I actually flush them down the toilet two times. And between the first and second time, I don't take my eyes of the toilet for one second. I am afraid they will crawl up again. Sometimes I also lay toilet paper on top of the water, after the second flush, so to make a barrier they can't come thru. I would definately prefer poisonous snakes instead of spiders. Non of them we have in Norway are any dangerous. But that does not help a bit. We don't have snakes either, or any dangerous animals, so there is plenty of time to be afraid of spiders, since there is nothing else to fear. In the south, they have two sorts of snakes. One of them is a little dangerous, but nothing really bad. We have tics, not so much here in the north. But they can be really bad. And poisonous plants, but they are no harm unless you eat them. Immigrants from Asia do. They run out in the forest and pick a lot of mushrooms, the precise same mushroom as they are used to eating in Asia. Like Thailand and such places. What they don't know is that it just looks the same, but is for sure not. So every year immigrants have to be hospitalized. I don't think everybody survive either. Norwegians don't pick mushrooms without knowing exactly what species it is. And there are mushroom control centers across the country. So people should not really eat any mushroom at all that has not been examinated and approved by a mushroom control unit. But immigrants don't know that. And whole families are really seriously poisoned or killed by often quite small amounts.
I will never put real silk in my soap recipes either. What if that silk comes from China. No one has any guarantee that they have not cheated and used cheap spiders instead to make fake silk. So no, I don't take the chance. I will use corn flour as a silk substitute. But maybe potato starch is better? It does have a more silky feel to it than corn flour. But how it will behave in a soap, I don't know.