I want to create a sword that when sheathed remains limp/flexible or soft but upon being unsheathed it become hard like common steel.
So, something like the sword going soft when not exposed to oxygen or something from outside but will harden when exposed to that chemical from the outside.
So, something like oxygen or some other chemical from the outside hardening the sword but cutting the access to said element results in the sword going soft.
The flexibility would be similar to those in the old Chinese movies where limp or flexible swords (not historically accurate) are used, or Indian whip sword (real historical/traditional sword), but is only in that state when it is sheathed or not exposed to outside elements.
Undesirable methods of achieving this:
- Something that basically involves using heat or the lack of it is out of the question.
- Something that when pumped from inside makes the sword hard is out of the question too, because I already have that type of weapon.
Is there method or chemical that can achieve what I describe?