Ctuchik learns a final lesson, one cannot "destroy" anything, because it goes against the purpose of the universe. How does Polgara destroy the soap bar her father created in the beginning of the Malloreon?
It's hard to say since it's a very brief mention, and unfortunately, David Eddings is no longer around to ask.
"Not mine, it won't," she said, taking the cake of soap out of his hand. She held it up, balanced neatly on her palm. Then she blew on it with a slight puff, and it instantly vanished.
But, since Belgarath casually produced it in the first place, I suspect that he probably built it out of constituent materials around him (much as Polgara was doing manually) and she simply returned it to such materials. It's no more "unmaking" than burning someone to turn them back into carbon is.