Thermowood

I have some "thermally modified" sycamore, and ash.
The sycamore has gone much browner than before, and it smells of coffee when worked. The ash has a more glossy finish.
Both cut and glue and finish just as well well as ordinary, the colour difference is what makes it. special.
The treatment is very expensive and has a dramatic affect on the wood price, so dont go wasting any offcuts you have.
I will look for any photos I might have.

This is heat treated rippled sycamore scales on a giant bowie I made;

I used quite a bit of it when it was new and referred to as "roasted lumber". It is pretty cool stuff. We had a salesperson come to the shop and gave us a bunch of samples. As I recall birch looked quite a bit like cherry, red oak looked almost ebonized, close to black. My favorite was yellow poplar which looked incredibly close to walnut, except when you cut it it smells like a house fire. What I found most interesting is in changing the molecular structure poplar is no longer nearly as susceptible to water rot as it was, and remains more stable. We only used the poplar. I did an entry door, which normally you would never do in poplar, and did not even stave core it. To this day the door is in good shape and never moved. I also did a law library for an attorney who wanted it in walnut. After seeing the mock up and realizing he would be saving thousands (at the time it was about 40% less than walnut) he opted for the roasted poplar. Outside of the stink it was a nice product to work with. We did find though that there was slightly more checking at the board ends. I would suggest you give it a try if you are interested.