I have had sweetened condensed milk in the refrigerator for some weeks (or months perhaps?). The can was covered with aluminium foil.

I noticed some disk-like artefacts on its surface, which are harder then the rest of the product:

condensed milk

Full-sized photo

How can I know if this is mould or simply further condensed milk with sugar? Is this safe to eat?

If it is relevant: the content of sugar is 56 g per 100 g, while this product has 8 % of fat content.

  • 1
    $\begingroup$ You could try picking up a piece and putting on top of a slice of bread or some other nutrient in a sealable bag and leave it on a counter overnight and see if it grows? $\endgroup$
    – Cell
    Jun 18 '19 at 13:33
  • $\begingroup$ @Cell, that's a good idea, thanks! $\endgroup$
    – Fato39
    Jun 19 '19 at 12:11

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