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Can you turn screw-top jars upside down after filling them with jam or not? Are there dangerous substances in the lid? Expert Steffi Burmeister explains why it is no problem to turn twist-off jars upside down after filling them with hot preserves. Steffi's channel: / @steffikochtein Advertisement: Lots of things about preserving and for your self-catering kitchen: https://borago.de/kategorie/2-Haus_un... Steffi's videos: Steffi's 1st video: Turning jam jars upside down - sense or nonsense • Turning jam jars upside down... Steffi's 2nd video: SCANDAL: Turning jam jars upside down! • ???? SCANDAL: Turning jam jars upside down...