I drank water out of this coconut and then left it unopen in a fridge for few days, and this happened - see the yellow film. It is sticky and the taste is neutral. Doesn't look like mold. Is it bad, or is it good natural process?

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  • What do you mean by a few days? Coconuts are meant to be eaten or processed quickly Jul 12, 2019 at 15:47
  • 2
    @JulianaKarasawaSouza normally in a fridge it lasted much longer - like two weeks or so. It became a bit drier. I am just curious if this is bad or not since it doesn't look like mold!
    – Tomas
    Jul 12, 2019 at 20:44
  • But how long did you leave it in the fridge before opening? It doesn't look like mold but mold is not the only harmful thing that can grow on food... Jul 15, 2019 at 7:50
  • @JulianaKarasawaSouza I mean few days, don't remember exactly... maybe two, three...
    – Tomas
    Jul 16, 2019 at 15:40

2 Answers 2


From the question and the comments, this looks a lot like bacterial film growing on the inside of the coconut near where the water was housed, that is the area with the most moisture availability for the biofilm to form.

Coconuts are meant to be quickly eaten and / or processed after opened, if you want to save the meat for later, open the coconut, take the meat, dry it out and preferably freeze it or if you are in a dry sunny place, you can sun dry it.

Leaving it opened in the fridge without any further processing is more or less playing russian roulette with nature, it is only about luck and only a matter of time until it gets bad.


Yellow means it has gone bad, do not eat it. It should be eaten if opened and in the fridge within 2-5 days.

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