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Crude pomace olive oil is used because it is cheaper than using any other olive oil, and it doesn't matter what olive oil oil you use whether it is pure or crude. Crude pomace also gives the soap a green color which some manufacturers want.

Well these soapmakers use the boiled method in which they salt out their soap multiple times, thus getting rid of all the impurities. Castile soap was made with bad olive oil which was impure and cheap so that is somewhat similar to crude pomace. As for why the I think crude pomace olive oil...

It seems like crude pomace olive oil creates the best lather for an olive oil soap. Of course the long cooking time also helps.

With oils that smell bad or are rancid you should salt out to get rid of the stench and make the soap lighter in color.

Are there any books about soap that follow the same model as the book Salt?

There doesn't seem to be a lot of books on soap history, so I was wondering if anyone has some suggestions.

This and this website should help you on that route

This one guy that makes Aleppo soap in Turkey said they usually add Laurel at around the same time as the olive oil, but it takes practice to know exactly when.

Would 8-10 hours of cook time suffice when making soap with sodium carbonate?

Will there be any difference in the soap if you use sodium carbonate vs lye?

Yeah I wonder if it will give any other properties to the soap made or not. Some sources also mention that Marseille soapmakers use only lye, a mix of sodium carbonate and lye, or just sodium carbonate these days so I'm not 100% on which is the correct way.

Two downsides of sodium carbonate is that requires 6-8 hours of cooking with normal hp, but since all boiling recipes require a lot of time it doesn't matter in this case. But since it is weaker than lye you have to add a lot more sodium carbonate, and Im not sure exactly how you can figure out...

Well I know Aleppo soap uses saltwater, but I'm not sure about Nablus. I think the longer cook times are due to how big the batches are and for Marseille soap they use sodium carbonate, which is significantly weaker than lye.

TOMH is saying all these soaps we are talking about are made using the fully boiled process, which includes boiling the soap for several hours or days, and occasionally adding salt or salt water to remove impurities and glycerin from the soap from the soap.

For nablus and aleppo soaps refer to this thread. For Savon de Marseille refer to this and this website.

I'll try contacting them and also growers in Norcal to see if they have some crude pomace during the olive harvest season.

You could definitely use EVOO but many soapmakers use crude pomace olive oil and pomace olive oil since it is cheaper than EVOO. Also pomace and crude pomace have more unsaponifiables than EVOO which makes the soap better.

I believe that in order to get a very green aleppo soap you have to use crude pomace olive oil which is extremely green(pic above) and is hard to find, and you also have to use green laurel berry oil. The people who made the tan aleppo soap probably used normal olive oil and/or a yellow/brown...

My aleppo soap smells pretty much like laurel berry oil, no industrial/kerosene smell. I also think I have found a picture of crude pomace olive oil: http://imgur.com/sIe0cB1