PRB in a smoothie is an historic no no. Looking up something else I stumbled across a reference published in 1847 of PRB in a smoothie. It was not spoken of as anything but common and not new.
It was being done sometime before written about. When some one says there is no record of X before a particular date, I get a little itch I can’t scratch.
it’s a fine line between known and unknown, and they ‘could have had it’ and they did have it. Bacon had the earliest European recipe for gunpowder, but talked about it as if it was well known.
Athena sprang full grown and armed from the head of Zeus, but for the most part I think a tool was known, used, seen by others, adopted, modified and suddenly was common.