opium
on the right side of the page you can click on cp test results or keyword to search. the 'site takes a while to learn to navigate, but it's worth the effort. they have good quality scents.
results on c/p soap: scent was great-excellerated trace-slight color change.
you may want to make a test batch as it sounds a little touchy. also, i would blend the f/o with an equal part of you liquid oil from your soap batch. that way when you add it, it doesnt shock you soap as much. stir it in quickly just before pouring into mold, and hand stir-no stick after adding fragrance.
if you rtcp this shouldnt affect you as much, but you would be wise to watch it just incase.