BLUE TONGUE SKINKS

Hi, I know pine and cedar are a huge no-no for reptiles, and I'm trying to figure out if this would be safe to use. It has an amazing shape and size for my BTS to sit on top of. It may have been from a mulberry tree, but it's unidentified.

Here's are two pictures for reference, view of the cut, and view of the bark.

In case you were curious, I had disinfected it by putting it over a fire for more than 30 minutes.

Thanks in advance!

I use driftwood from outside all the time. I usually power wash it then sun-bake it for a few days for large pieces.