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I was cutting up a mango, when I noticed some black threads inside.

What are those?

They are quite tough, brown-black, about an inch long (2.5 cm). I've got a picture.

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3 Answers 3

up vote 6 down vote accepted

It's an indication that the fruit has started to rot:

When dark spots start appearing on the side of a mango, it's starting to rot. A mango can rot from the pit, the skin, or from the non-stem end. Any black fibers also indicate that the fruit has started to rot, and at that point, you need to toss it into the trash.

From: Student's Vegetarian Cookbook For Dummies, page 301

Edit: Yes, the above is probably being overcautious in stating “any black fibers? → trash!” It's from a “Dummies” book after all. ;) I couldn't really find another good reference. But I'm sure you can make the distinction between a piece of fruit that has a small brown spot and one that's black and shriveled. Still, the color of the fibers is a result of the late ripening/rotting process of the mango, rather than a result of an earlier stage in its growth. But having eaten this mango with the one, tiny black fiber shown in her picture, I don't really expect to read Mien's obituary on this site tomorrow. ;)

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I don't think it's rotten at that point. Overripe, sure. But, though I don't have a source off the top of my head, anecdotally, I've eaten tons of overripe mangos containing a few black fibers, and they tasted great and caused me no problems. –  Jefromi May 30 '12 at 18:03
    
Overripe mangoes are good for making mango ice-cream (the rotten sections need to be thrown off though). –  Nav Jun 3 '12 at 15:44
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I believe some mangos do that in early stages of over-ripening (similar to how an avocado does that). I usually cut around them and keep eating.

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Black streaks in mango. Please read the following articles from www.abc.net.au:

http://www.abc.net.au/site-archive/rural/news/content/201302/s3683453.htm

http://www.abc.net.au/news/2013-12-17/resin-canal-cure/5161094

These articles identify the presence of well delineated black veins in otherwise good, fresh mango as a "disease" of the fruit. It turns out that this is caused by the mango trees lacking sufficient fertilizer.

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Welcome to Seasoned Advice! Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. This time I added two sentences for you, but you may expand it too, to make your answer better. –  rumtscho Jun 22 at 15:18
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That's actually very good information, +1. Links go bad and not everyone likes to click them. To make this a stellar answer, take rumtscho's advice! –  Jolenealaska Jun 22 at 15:32
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