Come on guys... It's just flower and food color. It can't be that bad!
I think it's totally safe for the gear only if you have a weather sealed body and lens.
It does indeed originate from India but in Greece with have a similar event in a small town in central Greece (
Galaxidi), Alevromoutzouromata. In this case it is connected to the carnival.
According to the site of the prefecture of Fokida:
"Alevromoutzouromata
On Shrove Monday in Galaxidi the residents and the visitors go to the market, where “moutzouroma” and ”alevroma” take place. That is, people throw at each other soot (moutzouroma) and flour (alevroma). The beach becomes a battle field. There are clouds of flour and dense clouds of soot. This custom is very old.has deep his roots. Perhaps it dates back to the Byzantine era, that the clowns of the hippodromes colored their faces. This started becoming very popular in 1840. And this is because the vessels traveled from March up to November, thus the events of Carnival were also farewell events.
"
Photos