Hi! I'm still very new to soapmaking (maybe 10 batches under my belt) and I've been using phenolphthalein to test the ph of my soap. Some soaps read fine however, I have had a couple batches that read too lye heavy on the outside but when tested on the inside, even just under the outer layer, they read fine. Any ideas why this might be? Or suggestions? I've just cut the outer layer off and used the soap and no chemical burns just wondering what could be the problem. Thanks!