The color, hue, and patina of reclaimed wood will change slightly year to year; especially if used as exterior siding. Exterior walls facing south (in the northern hemisphere) will change more quickly due to direct sun exposure. Reclaimed wood exposed to the elements should be sealed or treated with a waterproofing agent. Make sure to spot test any kind of sealant or treatment to make sure it doesn’t adversely affect the appearance of the boards. You can stain reclaimed wood if it darkens with age due to oxidation by adding tint to a sealant – again be sure to spot test before applying to an entire wall. Look through some projects with reclaimed wood to see all the types of variations.