So many of the artisan soapmakers out there get their "information" from message boards or new soapmaking books for products such as shaving soaps and shaving creams. Often you will see things like Castor Oil INCI name: Ricinus Communis (Castor) Seed Oil which makes a soap that bubbles but those bubbles are large and do not create the "foam" type of lather that works the best for shaving. It also makes a very "water soluble" soap which rinses away easily but it rinses away too easily which doesn't help for shaving. They also use things like "bentonite clay" for "slip and glide" but what it actually does is to dull the razor blade! These are ideas that often come from these more modern resources! Shaving Soap and Shaving Cream are products that have been around for the last hundred or more years for Shaving Cream and many hundreds of years for Shaving Soap and what most artisan soapmakers don't do is to research formulas from old soapmaking books, cosmetic chemistry books and patents which would show examples of formulas that are similar to those "old" companies who the guys here go to for as their "old standards" from long known, respected companies!
The key here is the Ingredients list!
When you are making your selections for shaving soaps and shaving creams the most important thing to do is to look at the Ingredients list! Get to know what your "favorites" out there contain, get an idea as the the order of the ingredients (which also plays a role in this) of your favorites and see how they compare. As an example here's a list for Taylor of Old Bond Street Shaving Cream: INGREDIENTS: Aqua (Water), Stearic Acid, Myristic Acid, Potassium Hydroxide, Coconut Fatty Acid, Glycerin, Parfum (Fragrance), Triethanolamine, Sodium Hydroxide, Benzyl Alcohol, Methylchloroisothiazolinone, Methylisothiazolinone. If you check around you will find other British Shaving Creams with a very similar list in a very similar order hence there is a good chance that they will be similar in performance. The same should apply to shaving soaps. If you do your research for either of these types of products you may be able to find a commercial or artisan product that works for you! There are artisan soapmakers who do try to "emulate" older or commercial products out there and who do the proper research and those are the artisans who will be able to provide you with what you need!
Bentonite, eh? I'll pass.
Don't see any need to put oilfield drilling mud on my face.