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"There's black stains that look like mold!" "Isn't that a scratch?" Have you ever been surprised to find what looks like dirt or scratches on a wooden product you just bought?
This time, we have compiled a list of wood grain characteristics that are easily mistaken for dirt or scratches, with accompanying photos. If you suspect your wood product may be defective, try comparing the photos below with the wood product you have in your possession.
What are the things that look like stains and scratches?
If you notice any stains or scratches on a newly purchased wooden product, these are almost always the "individual differences" that are unique to natural wood. Just as no two people look exactly alike, each product made from natural wood also has unique grain, knots, and color.
In addition to differences depending on the type of tree and the environment in which it was grown, even wood cut from a single tree can have different appearances depending on where it was cut and how it was processed.
Stretch mark-like gloss

It is often seen in wood from the beech family, such as oak and chestnut. It appears when the cells that store nutrients in the tree become wood, and is proof that high-quality wood is being used. It is called "tiger stripes" because it resembles the vertical stripes of a tiger.
Black Line


These are marks left by attempts to heal scratches in the bark while the tree was still alive. When scratches rolled in along with the bark during the growth process, they are called "bark pockets," and when minerals accumulate in vessels (which are water passageways) or cells, they are called "mineral streaks."
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These are the marks left by leaves and branches as the tree grows. Small black dot-like nodes are called "pin knots."
Black stain-like

This is lye from the wood seeping out. It may appear after some time has passed since you started using the item. It is easily mistaken for mold, but there is no problem if you leave it alone.
Differences in color and wood grain

In products made from laminated wood, which is made by combining multiple pieces of wood, differences in the grain and shades of color may be noticeable.
Enjoy your one-of-a-kind personality
The great appeal of wooden products is that there are no two exactly alike. Even if at first you think the appearance is a little different from what you had hoped for, you will grow to love it more and more as you use it for a long time. Be sure to enjoy the "individuality" that only wooden products can offer.
If you suspect that the item has obvious defects such as mold, or stains or scratches that appear to have occurred during shipping, please contact the store where you purchased the item and attach a photo.


