Chemicals

There is a bottle

containing slightly

corrosive chemicals

that is sitting on the ledge.

Whatever you tried to

pour the chemicals on

wasn't affected at all.

You should try pouring the

chemicals on something else.

Pouring the chemicals

on the Rusty Key removes

the rust, making it usable

again. Now that it is clean,

the Rusty Key has become

a sparkling Green Key.

These are the chemicals

that you used to clean the

Rusty Key so that it was

restored to its original glory,

becoming the Green Key.