Rod's knife scraping scares the devil out of me.
Jerry, you have to be here, to see it.
The Gum Arabic, soaked in cold water 10-15 mins, and the gum has a consistency of Mayonaise.
Scraping it is like having a close shave, there is no resistance,
just a smooth brush of the knife edge, and all that brown gummy muck, slides onto the blade.
The big trick is to have it on the fleshy base or the thumb,
won't work anywhere else, needs a bit of "give"
Perhaps you are recalling discussion re use of 150 proof Everclear or 90 proof Absolut
as soaking method for "recent" US issues.
I have kept this in my folder "soaking"
I don't have much need for soaking anymore, the gum arabic is disappearing, more need for "bestine" for the self adhesives.