Lol
@Chris_S lots of people still use or used to use milk cartons before
Yes,
@KiwiMoose I use empty milk cartons coz they're always on hand since my teenager would rather drink milk than water *rolls eyes*
If you wanna do any intricate swirls you'd have to cut the long side. You'll have to do something about the opening on the end though. I cut a piece off the section I took off and taped it there.
Some sturdier cartons can also be reused if you line them, just like any wood loaf mold.
Some of my first batches of HP soap were glopped into them from the top, where I took off the part where the spout thingy is. That also works for something like an ITP swirl..
Mine have rounded corners so less beveling n shaving for me, they're all set once they're cut up. Smooth on all sides including tops except the end bars, when I cut from the top. And perfect long but narrow soap that fits in my hand.
What I do so it doesn't bow out is keep it in between something heavy. In my case, it usually stands vertically between the knife block on side and the wall on the other lol
The problem with this is, and I'm just guessing this is the cause, less surface area exposed to air hence less penetration so mine seem to stay soft longer. Could just be my recipe but there's only the small top for you to check if you're ready to unmold and first few batches I was hit or miss.
And
@Dean is right, depending on how you destroy your carton, you can either dent your soap with finger pressure or leave prints at the very least, dent it all if you drop it lol, cut or slice into it somewhere you don't want to lol
Almost all of this is the same is true for Pringles. If you line them you could probably reuse but since my teenager likes em I have a steady supply and I just tear it off lol Lining them also helps with unmolding if nothing leaked out to cause your lining to stick.
But I love my milk cartons and Pringles cans! I foresee I won't be moving on from them just yet like Dean hehe