It creates a harder bar, but also inhibits lather. So it is definitely a balancing act. You can add just a little bit (like 1 tbsp PPO) to get some extra bar hardness - you can dissolve it in your lye water or add it straight to your batter - if you add it straight you may be able to see the little crystals in your soap.
"Salt bars" are bars with a high percentage of salt - 50%-120% of your oil weight. These bars usually need a high (or 100%) value of coconut oil for a nice bubbly lather. Because the salt inhibits lather, you need a lot of coconut oil because it produces lots of bubbles and lather.
"Brine bars" are similar to salt bars, but the salt is all dissolved in the lye water. You need to use less salt for these to insure all the salt dissolves.
In both cases, you will have a hard bar that feels smooth like marble. The downside is that they typically wont last as long, because more of the bar dissolves during each use with the high coconut oil and salt content.
Hope that helps.
My salt bars last longer than my regular soaps most times. Even though they are high coconut (80%) and I use 35-40% Salt. They last too long in some cases. It will totally depend on the recipe and where you leave them between showers. If you let them dry out you are good to go.
I have said it before and Ill say it again - bathing with a salt bar is like playing in the waves and having bruddah Iz sing to you:
https://www.youtube.com/watch?v=oWtNtO5ELQw
I find them awfully soothing, and nicely cleansing without stripping. Ill even use mine on my hair once in a while if I'm horrifically grubby.
My bars are super simple 80% CO, 15%OO (or almond or whatevs), 5% Castor, 20% SF, 80% salt ppo. A nice mint & eucalyptus EO mix in the summer is SO refreshing.
I looked on some sailing forums for information about what type of soap they use/recommend to each other when sailing and bathing in seawater. Besides the synthetic liquid soaps (of various kinds) the most often recommended bar soap seems to be 'Kirk's Coco Castile' soap and 'Ivory' soap (both bar & liquid soap), and 'any Castile' soap was also mentioned by several sailor-types on those forums.
So it did not appear that they had heard that only CO soap lathers in the presence of salt.
While noodling around the internet, I found this sea salt soap recipe I'm curious to try.. Especially after reading this thread.
http://www.soaprecipes101.com/homemade-soap-recipes/sea-salt-soap-recipe/
Meh. To me that recipe looks like a regular soap with the coconut upped and too little salt to make much of a difference.
So you would suggest much more salt to really get a nice salt bar?
I've never used one, so I have nothing to compare it to..
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