I scored some construction scraps from a home construction site. Basically a bunch of 2x4 and 2x10 cutoffs that I plan to make into kindling. They look like indoor scraps - not the darker treated stuff. But I was a bit paranoid about the 2x10 stuff as it looked like they were scraps from a stairway and I kept picturing an outdoor stairway for some reason. I really think they were indoor stairway but not 100% sure. Is there a good way to tell? I don't see that green tint and they don't seem as dense as treated stuff usually is.