Lard works fine, but I do prefer the tallow. The bubbles are fluffier (but not as long lasting). The biggest difference is the hardness of the bar. Tallow produces a very hard bar. Of course, the more you play with soap making, the more you realize that there are lots of variables. Each oil, and essential oil adds it's own unique elements that can, and usually does, change the final outcome. It's one big science experiment!
