is this a byproduct of the pressure treatment or just plain old mold like I suspect it is?
Yes. It's a chemical treatment residue; the stuff that's forced in to the wood fibres when it's pressure treated. It disappears over time.
It disappears over time, and the wood warps to fuck.
ftfy
Any of the big box stuff I've bought has been literally dripping with tanalith.
Shit wood is shit, so yeah.
@NotThamesWater started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Yes. It's a chemical treatment residue; the stuff that's forced in to the wood fibres when it's pressure treated. It disappears over time.