I'm totally new here so don't know a lot about anything but have been a soap lover for years. Castile soap is/was traditionally all olive oil. In some countries if its labeled castile (Spain and Italy, I think) then it must be 100% olive oil. In the US people use it to mean 100% vegetable oil because it sounds good and who is going to stop them
From what I have read the original technique of making castile soap did produce a hard bar, but I don't know because I haven't made an olive oil only bar before. So if there are oils in this base other than olive oil it isn't a true castile. (should we really be able to call something
this when it's really
that, no matter which country we are in?)
All of this being said, I have never done MP before just CP. Do they list ingredients? What did they add to make it harder?