I don't know as I haven't tried this swirl yet (soon I hope) but I would guess it is for better control of your soap. That way you don't risk accidently not making it on the column and messing up your pattern. That's what I would end up doing!
Hi all! New to the forum and fairly new to soaping. Just wanted to spread the word, unless someone has had bad dealings with this company. They have lye on sale for $1.99/2lb bottle.
http://www.essentialdepot.com