Potato starch was what they used to use for wallpaper paste. I guess everything comes back around if you wait long enough.
To me, instant mashed potatoes have the same color and consistency of wallpaper paste.
When my son was ready to graduate from high school, we moved back to my home town. We found a place where we could get 50# of red potaotes for $6. I don’t think it took us too long to go back for another.