An external verification tool for steam sterilisation processes is autoclave indicator tape. It is made of chemically inked, heat-sensitive pancake paper that transforms visibly. https://www.dropbox.com/scl/fi/x6sbecf5dibqbaji4addz/Medical-disposable-products.pdf?rlkey=qwusus7s96zf0yr1h3hj6lf6x&st=b4rixu3e&dl=0