Flame of Rebirth? what does it do?

So obviously this item is coming soon, and i've heard it has something to do with trading and a scissor limit.

Does it add tradeability to untradable items? or does it apply a limit to items that are already tradeable?

for example, i want to trade this staff:

If i used a flame of rebirth, would it be tradable with Karma scissors, or will this stay untradeable?

thanks!