5000ml erlenmeyer flask for making yeast starters. Can be used directly on a gas stovetop but any uneven heating of the flask can result in cracking. We recommend using a double boiler method by putting the flask and its contents into a pot with a couple of inches of water in it and bringing it all to a boil. This creates more even heating of the flask and its contents. Do not put the flask directly on an electric element stovetop. Made from borosilicate.
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