12 thoughts on “Blue Boards

    1. A lot of wood was preserved with tar-based products at one time. In bright light – and as the wood ages over time – the preservative appears to have a blue tinge.

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    1. Thank you, Calvin. It makes me think about how widely tar-based preservative was used once-upon-a-time. I think it is still used on utility poles – certainly smells like it.

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