There are many other ways to clarify, but I wanted to test this method.
Articles I found:
https://mbdou42.ru/en/panel/lightening-with-gelatin-lightening-the-wine-at-home/
https://winemakermag.com/technique/715-using-fining-agents-techniques
It is next to impossible to make it back to original state, I tried with hot water and a number of reheat steps and did not succeed. I think it is because it is a suspension rather than a solution.