Dead Sea salt is very variable. From wiki: The Dead Sea's mineral composition varies with season, rainfall, depth of deposit, and ambient temperature. Most oceanic salt is approximately 85% sodium chloride (the same salt as table salt) while Dead Sea salt is only 30.5% of this, with the remainder composed of other dried minerals and salts. You are not going to get consistent reliable results using Dead Sea salt in soap. I think most of us try to aim for that.