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What is the blue dye on edges of OSB boards?

~~OSB boards are often sold with a blue dye on the edges:~~
![Image_alt_tex](https://proposals.codidact.com/uploads/mhnq6m6s8yv3nq450wqgf92xad7t)
What is this? I'm assuming it's some kind of chemical protection. Does that mean that when you cut the board and leave an un-dyed edge, it is vulnerable to *something*?

Oriented strand boards (OSB) are often sold with a blue dye on the edges:
![Image_alt_tex](https://proposals.codidact.com/uploads/mhnq6m6s8yv3nq450wqgf92xad7t)
What is this? I'm assuming it's some kind of chemical protection. Does that mean that when you cut the board and leave an un-dyed edge, it is vulnerable to *something*?

home-improvement engineered-wood

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