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Broke open this rock and what looks like tar or crude oil is inside in small pockets, any ideas on what it is? : r/whatsthisrock
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Discovered strange black tar-like substance inside of wall? Smells faintly like tar as well. Can anyone help identify? Is it toxic? : r/whatisthisthing
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I'm A Scientist! My Rubber Bales! Or Shipping Black Tar in Foil Through International Mail - San Pedro Scoop
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