Good idea about the ruler.
Don't think there is red on the untreated one, I just need a better photo.
I DID rinse it off, in fact it was 2 tablespoons, rubbed on, set 10 min, rinsed off (with Smokin'Jr. on the stop watch).
there was just a "slight" taste of salt, but didn't seem like a lot. Mrs. Smokin' liked it because it was slightly saltier.
Smokin'