A comment by dfife on the Q&A Which woods work well with ammonia? says:
You can also soak any piece of wood in tea (or something else high in tannins) and give it a higher degree of tannins. I've done this quite successfully with pine and poplar.
I would like to try this, but have some questions about the process:
- How long should I soak the wood for? Does the length of time vary by species or by how strongly the tea has been brewed?
- Will the wood warp as it dries, and if so, how can I minimize that?
- Does the color change as the wood dries? If so, how much, and does the grain become more or less emphasized?