I apologize for the confusion, but there is no refined wood material called Juniper Plank in Skull and Bones. It seems I have made several mistakes in my responses regarding refined wood materials in the game.
Skull and Bones features the following refined wood materials, categorized by rarity:
Common:
Uncommon:
Rare:
Therefore, if you’re looking for information on specific refined wood materials in Skull and Bones, it’s best to refer to the ones listed above or consult official game resources. I hope this clarifies the situation!