Decomposition is an important process in nature which returns nutrients to the environment, but it’s such a slow process that we can seldom appreciate its progression. In the videos that I’ve selected below, the folks of the YouTube channel TEMPONAUT armed themselves with patience and filmed the slow day by day decomposition of several fruits and vegetables.
The first video is that of a peach rotting. You can see how the mold (probably from the genus Penicillium) that appears is white at first and then turns green when producing spores. Another interesting feature seen in the video is the way the juices of the peach come out as droplets through the mold.
Apart from the obvious changes such as the growth of mold, decomposing fruits experience a large decrease in their mass due to loss of water. This can be easily visualized in the video below which features the decomposition of a honeydew melon fruit placed on a scale.
In the video below, which shows a rotting lemon, you can again see the appearance of a white mold that turns green and covers all the lemon. However, later on you see the appearance of more white mold growing over the green mold on top of the lemon, but this white mold turns a blue color. I don't know if this is a new type of mold that takes over the green one. Also, in the previous videos you probably noticed some tiny things moving all over the moldy surfaces of the rotting fruits and falling over the sides. These are mold mites. These insects feed on the mold. In the video below you can see the little critters laying the whole field of green mold to waste!
The video below shows a potato rotting, and there are closeups filmed in real-time that allow you to see the mold mites clearly.
If you have the curiosity (and the stomach), you can check the TEMPONAUT YouTube channel for time-lapse videos of many other things rotting away.