Do you think it's safe to burn this?
“Burn” or “turrn”. Yes to both. We have a lot here.
If you burn, maybe do it outside.
If not familiar with box elder, it feels and turns about like soft maple. I personally don’t turn it any more.
The piece you have shows a lot more color than most I’ve seen. It looks beautiful at first but the color fades rapidly. Years ago I made some pieces with lovely bright red streaks. Today all the red streaks are dull brown.
Using UV resistant finishes and keeping pieces out of the light may help, at least for a while. Some say oxidation affects color.
Some who love and want to keep the color in any wood do so with dye applied with a small paintbrush.
This article focuses on color in exotic wood but in include info on some US domestic species, including box elder.
The bottom line: don’t expect color to last.
(oops, forgot to paste the link)
www.wood-database.com
However, maybe it will surprise you. For example, I did some tests with some pieces purple heart and it all eventually turned brown. Then I acquired some reportedly grown in Mexico. That particular wood has refused to turn brown after years on the shelf.
JKJ