Can cremating bodies cause black rain?

Question

There is speculation that the mysterious black rain that Japan had a few months ago was from China cremating bodies, and in particular, mass cremations from coronavirus victims.

7 News: Coronavirus victims’ cremated bodies blamed on ominous black rain falling in Japan

There are claims the sludge is the fallout from a mass incineration of coronavirus bodies in China, the aftermath of a nuclear test in North Korea or the result of fuel dumping from planes flying overhead.

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The most plausible explanation appears to be a recent fire at a plastics factory in Noda, in the neighbouring prefecture of Chiba, but this has not been confirmed either.
Daily Mail: Incinerated coronavirus bodies, North Korean missiles, and airplane spillages among theories to explain 'disturbing' black rain falling over Japan

Another Twitter user wrote: 'Are they secretly burning the bodies of coronavirus victims?'.
The Sun: Sinister ‘black rain’ falls over Japan sparking conspiracy theories its caused by cremated coronavirus bodies

Was this black sooty rain caused by mass cremations?

Probably the mass of the bodies would be far to small, but [biomass burning does contribute to black carbon](https://ec.europa.eu/jrc/en/publication/long-term-trends-black-carbon-biomass-and-fossil-fuel-combustion-detected-jrc-atmospheric). Not sure if there are any forest fires in the area at the moment. Perhaps a starting point for someone answering the question. — gerrit, Jun 18 '20 at 09:11
It seems to have been reported originally by https://soranews24.com/2020/03/04/black-rain-falls-over-parts-of-saitama-prefecture/ There apparently was a fire in a factory nearby but I haven't checked all the details yet. — Entropy, Jun 18 '20 at 09:15
Very nice. Yes, around this time there was also the reports of 21 million missing cell phone users, which really fueled this. However, I remember seeing recently that a probably reason for the cell phones was due to people cancelling their second phone during covid. I am not sure if this quite makes sense, but it seems at least somewhat "reasonable". During covid I would expect phone use to go up though. — , Jun 18 '20 at 18:37
The daily mail article provides a far more likely but far less exciting explanation: *"It later emerged that a 'gigantic' fire had broken out in Hasuda around the time of the rainfall. It was the blaze, at what is thought to be a large commercial building, that was speculated to be the cause of the black rain."* — Philipp, Jul 23 '20 at 09:13

Can cremating bodies cause black rain?

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