Ok I'll ask... How do you know?
I've heard it's too much baking soda that will turn them to mush. Is it strictly salt that will do it or too much soda as well?
I'm asking because I'm ignorant on this and not to say your wrong.
Because they taste like ****! I've heard the same thing about baking soda turning them to mush, but I've not experienced it. It doesn't take much. Just add 1/8 tsp (up to 1/4 tsp) for every cup of beans you are soaking to the water you are soaking them in. The time I added salt when I cooked after soaking my beans in baking soda I thought they were WAY too salty tasting. GC didn't seem to mind them but the man will salt a slice of buttered bread until it is salt-crusted and eat it. Bleech ...
I will tell you this ... the less baking soda you use the more bite the beans will retain. So ... if you are wanting to make refried beans go ahead and use 1/4 tsp or maybe even a little more. Wanting to drain those beans and use them in a salad, relish or some other recipe that needs the beans to hold their shape? Use the lesser amount. It's kinda like baking bread ... there is definitely an "art" to it ...