Chemically Treated?

[chemie]

I took some advice from my previous posts and ask some sawmills to see if they have any scrap wood they can give away.
One guy was very nice and gave me some old lumbers . He said they should be fine for burning and they are not pressure/chemical treated.

A few of them having darker resins that I suspected of chemical treatment.
I’d like to make sure and get your opinion on them. I appreciate your feedbacks!

 

[begreen]

Most of it looks ok. The rounded log may be a treated pole. Hard to see from the picture though it does look a little greenish. If it burns with a green flame it probably has been copper treated.