Gathering brings in the raw goods. Refining makes the common materials from them, and refining a common one again with an additive makes the uncommon ones. Production takes them from there.
Uncommon wood, refined from Pine Timber with Sooty Bark by Milling at level 20 (recipe).
One Crimson Pine Timber takes 12 Pine Wood, 1 Sooty Bark, and 8 Creosote.
Refined further into:
Production takes it, or its forms, in 235 Carpentry, 1 Alchemy, and 4 Tailoring recipes.
What it adds to gear parts made from it: