As a small feral child growing up in the woods, I used to eat bark from various trees and munch on different types of plants that I found. I have a very distinct memory of the sap in these fir tree pimples tasting absolutely awful. I'm guessing this is not used for food? For what purpose would a person want this sap? Can you make adhesive out of it? Varnish? The stuff is nasty and doesn't wash off your hands.