The rubber ball George and Fred bought was quite unusual.
It had originally been intended to become a Quaffle, but a problem with the materials had turned it into a defective product that was discarded.
That was how the Weasley twins had gotten hold of it.
The little alchemy booklet recorded a very simple and crude form of alchemy.
It involved directly casting spells on certain objects to grant them magical properties.
This was the simplest technique in alchemy.
Strictly speaking, the Marauder's Map had been made using this method. It was just that the spells cast upon it were far more complicated and refined.
The advantage of this method was its low barrier to entry. By layering spells, one could alter an object's properties and grant it magical power.
But its drawback was equally obvious: it was not stable enough.
"Fluffy eats Rock Cakes like crisps. This toy ball needs to be hard enough first..."
Silan waved his wand and cast a Petrification Charm on the rubber ball.
The originally dark-brown rubber ball instantly turned grayish white, like exposed rocks on a hillside.
Holding the stone ball in both hands, he found that it had become as heavy as an actual stone.
"Too hard won't do either."
Silan tapped the stone ball with a finger. "But there's no way to turn it back into a rubber ball now."
Although he had swiped plenty of herbs from the greenhouse, Professor Sprout still did not dare let them handle dangerous and precious herbs like Mandrake.
If he used a Softening Charm to cover the stone ball's surface, could he give it elasticity that way?
After thinking for a while, Silan waved his wand and cast another Softening Charm on the stone ball.
This spell was recorded in The Standard Book of