Those little black marks are actually a natural result of your woodâs own chemistry â something called tannin reacting in the wood. In this post, weâll explain what tannins are, why these dark spots appear (theyâre not mold), and why theyâre actually a normal characteristic of real hardwood.
Donât Panic About Those Dark Spots on Your Oak or Walnut Furniture
Donât Panic About Those Dark Spots on Your Oak or Walnut Furniture
Those little black marks are actually a natural result of your woodâs own chemistry â something called tannin reacting in the wood. In this post, weâll explain what tannins are, why these dark spots appear (theyâre not mold), and why theyâre actually a normal characteristic of real hardwood.

These two smaller dark areas in the top big circle might seem unnoticeable, however, after pre-color treatment they might become very obvious!
08/06/2025
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