there you go is right - learn something new every day.
Now it makes me wonder if the jin/catty or 17 oz is based on some numerology/superstition history. It is so close to the weight of a pound that is seems too coincidental that two cultures came up with the same measure independently (but of course that could be too). Or maybe the jin came first (what do I know). But curious indeed.
I first got to know of the catty on a visit to Hong Kong. And to make things confusing, there’s the new catty and the old catty. I don’t remember which is which.
I have no idea what the jin/catty was originally based on (probably something much like the grain kernels, human thumbs, and beer barrels that gave rise to pre-metric European units of measurements ) but I’d bet fairly serious money that the “jin” predates the “metric system” but numerous centuries if not a millennium or two, and that the metric equivalence of (“exactly”) “500 grams” is merely one of convenience.
But it is interesting. These days I generally assume that “odd” avoirdupois measurements are the result of metric packaging and in this case, would probably have conflated solid ounces with fluid ounces and assumed it was in fact a “500 ml” bottle (which is at least in the ballpark of 17 fl ounces), but of course I would’ve been wrong…
Last night I was pondering if somewhere in China there was a food blogger who was looking at some American product that had only 16jin/catty in it and wondered; “Why would someone sell a product that was just .1 jin/catty short of a full”. (no I wasn’t stoned)