BRAIN TEASER!

I came across an "OLD" recipe for apple crisp. Heaven only knows how old it was because it called for a tsp of "Sweet 10". Neither me, my daughter, or my 86 year old mother knew what Sweet 10 was. Today, however, I seem to recall it was an early alternative sweetener, a liquid, in a tall skinny bottle. Does anyone else remember Sweet 10? I was just curious because 9 out of 10 times I'm usually wrong. If so, please let me know so we can appease our curiosity.