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Olive oil soap is very hard, not sure why you would want to measure hardness. Use a small amount of sea salt in the water before adding the lye ( 0.8g/oz of water) Keep water to a minimum; you want to use a ratio of 25-30 percent water to oil weight. You need to mix with a stick blender until it has the consistency of heavy cream.
Hi Tyss, you are referring to soapcalc. I rely on their software too to calculate my ratios, but I am not convinced that their soap rating is the bible. If you buy olive oil soap that has been cured for 6 months, you will notice that it is rock hard. I make some on a regular basis with 25% water, which I unmold in 2 days. I cure for 2 months and it performs as well ( not melt in the shower) as a blend that rated on Soapcalc at 40 for hardness. You can also use sodium lactate instead of salt.