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Can I dye it and change the color with the sunburn? I would like to take it more to a light brown

Thanks when I got it was very stiff so I really soaked it inside and out with the olive oil, how long should I leave it in the cat litter? With the current orange/brown color could I dye it more a tan color/

I had a custom sheath made with tooling the background was dyed and the rest was left natural, I oiled it with olive oil and put it in the sun, and it turned a redish brown color which I am not wild about. What can I do at this point? Is there a way to bleach out or how would I now prep it to try and dye it?