Why do dark spots appear on the surface of the leather cover?
This is for a situation where someone takes the delivered leather cover out for the first time, spots dark specks or stains on the surface, and wonders if it is contamination or a defect in the leather.
They are natural marks that occur during the tanning and dyeing process of natural leather when components in the material react with iron in the air.
When you unpack the product and take it out, scattered dark spots on the leather surface may catch your eye first. Hobonichi leather covers are made from natural leather without heavy surface processing. In addition to wrinkles, blood vessel marks, and fine scratches remaining on the raw material, black dot-like spots can also form during tanning and dyeing as leather components react with iron in the air[1][2].
Generally, during the processing of natural leather, tannins inside the leather have the property of combining with microscopic iron particles floating in the air and oxidizing into a dark shade. Due to the nature of natural leather that does not undergo processing to cover the surface with a synthetic coating, traces of the environment and air exposure at the time of manufacture naturally appear as specks on the surface of the material.
Hobonichi ships products in paper envelopes dedicated to the leather line to prevent leather covers, which react sensitively to light and air, from discoloring due to sunlight or external environments during transit[3].
It has not yet been confirmed whether the spots caused by the iron reaction naturally blend in as the leather ages over time, or if they can be softened with a dedicated leather care cream.
Product measurements
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Leather: Noble Silver Weeks Hardcover Book
Other stated figures
| Part | Value |
|---|---|
| 무게 | 138g |
Leather: Taut (Brown) A6 Original Size
Other stated figures
| Part | Value |
|---|---|
| 무게 | 90g |
ONE PIECE magazine: Going Merry Logbook A6 Original Size
Other stated figures
| Part | Value |
|---|---|
| 무게 | 139g |