Weird green and black area on newly sistered joist

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So we had the sellers fix a couple things. One of those was sistering a split joist in the crawl space. Whoever they had sister it looks like they did a decent job but the wood they use has some weird green marks on the top and a black mark to the bottom left of those. See image: https://ift.tt/39NSIJH am I just being paranoid. via /r/DIY https://ift.tt/3qBExOs

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