I made three batches of soap today. I mixed up my lye water in the afternoon and made the soap after dinner. It sat out in an open container (safely out of the way of anything or anyone). When I went to use it there was a crust over the top. The first pitcher I just stirred it and broke it up and used it. I could see some flakes in the soap. Scooped out a few larger ones but there were lots of little ones. The next batch I decided to pour through a sieve. The lye water (50%) was very thick and didn't run through easily. There were flakes in the sieve and a bunch in the bottom of my pitcher. That batch took longer to trace than normal. Now I'm wondering if there was enough lye in it. The third batch I mixed new lye water for. So what was this? Did some of the lye crystalize on top the water? Do those of you that mix lye ahead of time experience this? Or is it because I didn't cover my container?