I know that a significant proportion of my readers are from the USA, and so someone should be able to inform me of the answer to my question fairly quickly.
I’ve seen that people use it to dye yarn.
I’ve seen references to people who have been acting strangely being asked if they’ve drunk the Kool Aid.
I could Google it, but I was genuinely interested to see whether, out of the kindness of your hearts, someone would put me out of my misery! (Remember the mystery giveaway for all early August commenters!)