Yes and no
A chemical change :).
Molecules permanently change. In a physical change the effects are reversible.
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Nobody knows
You can permanently change your eye color by getting eye surgery
You cannot change cylinders. They are permanently cast into the block.
TO permanently remove your mi33 id you have to go to settings under change mobile number or email. Once there do not activate the code and then your account should be deleted permanently.
If you can access the account at all, you don't need to permanently delete it - just change the password.
Forces or something?
Hair is constantly growing in your natural colour so no dye could permanently change your root colour.
Demetrius is permanently under the influence of love-in-idleness and so will continue to love Helena after his fashion.