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i took my camera but it was out of juice so i apologize for not having pics ... i did a demo this weekend near a downspout that emptied out onto the roof and when i checked it this morning the "stains" were still there. i figured that since the love was heavily diluted with ammo from a house i did earlier in the day, it just wasn't strong enough. i mixed 50/50 in a pump up and this time i was right next to the shingles, and the black stuff wouldn't come out. i've never seen it before (not that i have a huge sample size) and i can't tell if it's granule loss, tar, or if somebody is just out to make my monday morning more miserable than it already was? ... again sorry for not having pics but hopefully somebody knows what i'm talking about.