Finally cleaned up my 10 gallon isolation tank in which kiwi passed away in

i removed two turbos and boiled them washed them with dechlor water than boiled again and let dry over night they turned from green and brown to a dull white does any one know why and what's wrong with them ? I'm afraid to put them in my main tank.
I also want to add once their wet they look normal they have been deep cleaned 2 times no idea why they look white like this
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