"Certo" bottle. How old?

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ROBBYBOBBY64

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If I remember correctly it was used in the canning of jams and jellies.
Robert Douglas invented Certo. He at the age of 19 created the first thermometer while working at his fathers jam business. It told when the jelly or jam was ready. It is still the one used today. Certo is basically pectin.
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ROBBYBOBBY64

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My Certo is 1960. Made by Knox glass bottle Company.
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relic rescuer

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Can't send pics ATM. Stupid computer probs, but I have three similar, one is light amber like yours. I found them in a W2 era farm dump. It's good to now know what they were for.
 

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