I make a shaving soap that my hubby loves and it lathers like crazy. I probably should mention that when I say 'lather', I'm not talking about the kind of lather made of huge fluffy bubbles, but a creamy-type lather instead that is almost non-existant when worked up with the hands, but voluminously and copiously foamy when worked up with a shaving brush (which my hubby likes to use). It's incredible- my shaving soap lather, when worked up properly with a brush, looks exactly like the foamy stuff that comes out a can of Barbasol shaving cream. It stays foamy for at least 15 minutes, too.
I formulated my shaving recipe to have a high amount of naturally occurring stearic acid- meaning that instead of using stearic as an additive, I use certain fats/butters that naturally contain high amounts of stearic. The total stearic amount of my formula is 20%. Stearic acid contributes lots of creamy, stable lather- the kind of lather that's perfect for a shaving soap if you are going to be using a shaving brush. If you don't have enough naturally occurring stearic in your formula, you can buy stearic and add some to your formula.
My goal was to have a shaving soap that was very low on cleansing, very low on bubbly lather, very high on stable/creamy lather, and high on conditioning. Happily, I was able to achieve all my goals.
Eighty-six % of my formula is made up of beef tallow, castor oil, kokum, mango and ilippe butters, while the remaining 14% is made up of avocado oil, coconut oil, and olive oil.
For additives, I use coconut milk as part of my liquid amount (adds even more creaminess), and kaolin clay & tussa silk for slip.
My 'secret' ingredient is 10% vegetable glycerin ppo. I learned from another soaper named Hanle that glycerin, along with a high stearic amount, helps to create a stable creamy shaving foam that that will stay suspended for a fairly long time without fizzling out. According to the guys over on Badger and Blade (a men's shaving forum), a good shaving lather should stay suspended for at least 10 minutes. Mine stays suspended for at least 15 minutes and could probably go on for longer
if I had the patience to let it do so before washing it away.
IrishLass