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There are more and more twist-off caps with blue seals on the market. Twist-off lid seals have been made of PVC since the system was invented. The blue seal is not made of PVC. I explain what it is, where it comes from and why it exists in this video. You can find Blueseal lids here: https://www.glaeserundflaschen.de/BLU... You can find preserving jars, bottles, jars, accessories for preserving and much more in our shop: https://www.glaeserundflaschen.de/ ????