Monday I'm headed back to our family mill to stack and sticker a pile of walnut and pine boards. While the saw was running I got to wondering how much it matters what wood you use for the stickers. Can a different type of wood affect the color on the lumber while it is stacked and drying? I've noticed shallow discoloration on boards (sometimes deep) from the sticker, but never thought much about it. I don't know that it matters much, but I'm curious what other folks do...