Thanks for your response. Can anything be added to counteract the lack of longevity?No, it doesn’t mean it will go off sooner. It means how long the bar will last in normal use, and and is based on the solubility of the soap.
The number comes from Subtracting the cleansing value from the hardness Value.
Some soaps, like pure castile (100% olive oil soaps) will be hard enough to pound nails with after a long cure- but will not last as long in the shower due to its higher solubility.
While salt may make a harder bar, it is only for the purpose of unmolding. Hardness and longevity are not the same. You want oils high in stearic and pamitic. I thought beeswax did not contribute to longevity, but I could be wrong. I have never used it.Thanks so much for your advice, it's much appreciated. I am trying to create hemp soaps which are also vegan. I've worked out a recipe but the only problem is longevity, so I will now look at the additives you mention above to counteract this shortcoming. Thanks again. Love the website and recipe builder btw
It's often ok to have it in the red, if everything else is ok.I have also been wondering about this. I've tried a number of recipes through the calculator (which I love!), and every element has been well within the recommendations except Longevity. My longevity number has been in the red every time! I'm a novice soaper.