Honestly, I know that nut allergies are of concern, but people can be allergic to the darnest things, so isn't it better to make what you know turns out well and label it properly with the disclaimer that it contains such and such and if you have a known allergy, do not use this product? If you make a milk soap and someone has a dairy allergy, wouldn't you just do that?
I guess I am not afraid to use all different oils, but am willing to disclaim myself up the ying yang because in the end, the user is the one responsible to determine if it's safe for him/herself (or other family members).
Thoughts?
I guess what I am saying is don't deprive yourself of soaping happiness by eliminating things that someone "could" be allergic to. If you want to make a nut batch and then a non-nut batch, just make sure to clean all your vessels and surfaces thoroughly and still put a disclaimer on the soap.
Someone recently mentioned that shea butter could be construed as a latex derivative or some such and therefore people with latex allergies would have a chance for reaction.
So, see...just an all purpose disclaimer/allergy alert on all bars and you have warned the public.