A sample is taken from molten metal
Red heated liquid metal is boiling. A sample for tests is taken from it with a special bucket.
https://www.shutterstock.com/ru/video...
https://stock.adobe.com/contributor/2...
https://videohive.net/user/meh21/port...
http://www.istockphoto.com/portfolio/...
https://www.videoblocks.com/portfolio...
https://www.pond5.com/artist/meh_21