natural preservatives

Hello all, I have been an amateur soaper for a a few years and loving it! Although I dabble mostly in hot and cold processed bar soaps. my repertoire also includes just a few adventures with cream and liquid soaps. As my username might suggest, my adventures often involve botanicals, mostly...

I searched the forum for some info on this but couldn't find much. So what I want to achieve: - Have soaps that don't have orange spots after some time and stay at least 1 year before they go bad. (cold process) On a search on google I found: Use Rosemary EO in it, since it's a natural...