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Just to show that everything doesn't always go perfectly even for experienced soap makers.
Yesterday, I was making a pretty straightforward batch of soap. I had melted the oils, added the lye, and was just at a light trace. I added the fragrance oil and then ladled out a bit of the soap to do a color swirl...and added the color. When I turned back to the larger bowl that had the uncolored soap...it was nearly solid. It had gone from pourable to one big lump of soap in a matter of about 30 seconds.
It happens to all of us at one time or another. It's called a seize in your batch of soap. Here's some more information about it, how to prevent seize, and how to deal with it if it does occur. (Yes...I was able to salvage the batch!)