1. Check Wood Toxicity
Did you know there were toxic woods? [Read this: Your DO NOT BURN List]
Some woods might be okay to burn here and there. But in large
quantities or over a long period of time, certain woods are known to
cause long term lung damage, even cancer.
All the pyrography books say to "check wood toxicity" before you use that wood for wood burning art.
How the devil do you do that??
I'll show you.
Start by asking mother Google. She knows all (or maybe she's just a know-it-all, heh heh).
Is [_This_] Wood Toxic?
Start with this simple search and see what shows up.
I tried this basic search: "is maple wood toxic?" Apparently, it's toxic for horses. But nothing big in the search came up for humans.
Is it safe to Burn [_This_] Wood?
This is going to mostly bring back results about burning wood in your fireplace, woodburning stove, or outdoor fire pit.
If it is NOT safe for your fireplace, it's probably NOT a safe wood for wood burning art either.
If it IS safe in the fireplace, there's a good chance it IS a safe wood for wood burning art too.
Check Wood Toxicity Tables
You want to see if the wood has common, bad reactions - specifically for dust, bark, oil and sap since that's what we pyrography artists deal with most.
Breathing in any wood dust is bad for you (wear a mask my friend) but some woods are more irritating than others. Some bark has common allergens and irritants, and sap and oil can create toxic fumes when burned.
Here is a good chart to check for wood toxicity and another article explaining other dangers that could make a wood toxic.
But there are more. I recommend looking at several.
Just because a wood isn't on the do-not-burn list and passes the text on toxicity tables doesn't mean it's always safe.
Some people are more sensitive or allergy-prone.
What works amazingly for thousands of people could be extremely dangerous for you.
When trying new wood, try it out in small doses. Burn a small piece. Then burn a larger piece.
Notice if you get light headed, dizzy, headaches, or allergy symptoms overtime. If those things show up, choose a different wood.
5. Slices VS Slabs
As a general rule, wood slabs are easier to burn that wood slices.
What's the difference?
A horizontal cut of a tree makes a round wood slice, also known as a "wood cookie" (that actually IS the technical term lol). If it's completely raw, it will come in a circular-ish shape, show all the tree rings, and probably still have the bark all the way around it.
Since this is cut against the grain of the wood, slices tend to be tougher wood for wood burning art.
A vertical cut of the tree follows the wood grain up and down the tree. Since slabs are cut along the grain instead of against it, they show less tree rings or veins of grain and tend to be easier to burn.
If they're live edge pieces (meaning they still have the bark on them) the bark will line 2 out of 4 sides.
So regardless of what wood you buy, just know that the way it's cut makes a difference in how it burns.