Corrupting Potion / Touch of Corruption

When I think of something being corrupted, .. I think the result should have a lasting effect.

What if using Corrupting Potion enough times actually causes the Touch of Corruption effect to become permanent?

Even if it isn't as strong, or maybe it becomes permanent at a certain number of charges, but increases in strength after x more charges until it finally becomes negligible enough of a difference to sell.

The issue that I would see coming from this would be that the way it works currently means it could be spammed in fountain.

To get around this, it could be adjusted so that there is a cooldown on how often it can be refilled.

I think this could be an interesting change that would make it a more common starting item or at least an early sustain item.