I'm helping out with the new soap calculator here for SMF, and the question of adding masterbatching lye to it came up. Since I have never done it (can't have lye solution hanging around), I need some advice on how to go about mixing it, and the amounts, and then how to use it in a soap recipe. Can anybody explain it to me, so that I can understand what benefit it could be? I know for large batches it could save time, but other than that, is there a benefit? And how exactly is it used in the soap recipe then?