Bubbles

I found a few pictures of the most recent birch spoon in my computer. The most interesting picture shows how the spoon is soaking in oil:

If you look closer, you see how many tiny bubbles rise from the wood. Denser and less porous wood (like apple, plum) behaves differently; you would hardly see one or two bubbles. On the other hand, many bubbles came from oak, walnut, birch and lime.
If you use walnut oil, there is one more important thing to do: porous spoons which absorbed a lot of oil, should be left in direct sunlight for a few days to let the oil harden properly. It is not really necessary in case of dense woods.
The only really sunny window in my flat is occupied by cactuses, so I usually leave such spoons propped against the flower pots for a few days :)