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Idea_Ranch posted on r/rocketry25w
I can’t find the reference at the moment but I recall an article where they referred to this product. (I recognized the box because my Grandma used this stuff for canning jams, jellies, etc. back in the day.) As nearly as I can tell they haven’t changed the package in 50 years. (I’m old af and it’s looked like this my whole life.) You can buy online or look on grocery store shelves near the canning supplies (which are usually near the foil, plastic wrap, Ziploc bags, etc.). EDITS: Fix typos because I’m old af