[HELP] Identify Floor substance / possible mold?

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ErikT

Member
Joined
Jun 10, 2020
Messages
7
Location
los angeles
Hello all,

I am currently in the process of installing new flooring (DIY) and came upon this weird black substance

I am unsure if it's remnants of old glue or if it's possibly mold or something were I need to hire a professional to remove.

I am attaching a picture of the substance in question

Thanks to all who reply.
 

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